pygame, problem with triangle and square collision. fix?

Question

I want in my game to end the game whenever the green triangle hits the square. I don't know why the collision doesnt work, could you help me with this problem?

import os
pygame.font.init()
pygame.init()
import time
#VARIABLES
#-------------------------
 #SCREEN
width, height = 900, 500
WIN = pygame.display.set_mode((width, height))
FPS = 100
clock = pygame.time.Clock()
FONT = pygame.font.SysFont('verdana', 100)

 #EVENTS
square_hit = pygame.USEREVENT + 1

 #COLORS
white = (255,255,255)
black = (0,0,0)
red = (255,0,0)
green = (0, 255, 0)
blue = (0, 0, 255)
#-------------------------

Here i'm desplaying the window

def draw_window(square, triangle, score):
    #SCREEEN
    WIN.fill(black)
    #SCORE
    score_text = FONT.render("Score: " +str(score), 1, white)
    WIN.blit(score_text, (width - score_text.get_width() - 10, 10))
    #OBJECTS
     #LINE
    pygame.draw.line(WIN, blue, (0, 400), (900, 400), 10)
     #SQUARE
    square.draw()
     #TRIANGLE
    triangle.draw()

    pygame.display.update()

Here is the triangle (enemy) class

class Triangle():
    def __init__(self):
        self.x = 700
        self.vel = 10
        self.triangle_rect = pygame.draw.polygon(WIN, green, [[self.x, 395], [self.x + 50, 395], [self.x + 25, 345]])

    def draw(self):
        pygame.draw.polygon(WIN, green, [[self.x, 395], [self.x + 50, 395], [self.x + 25, 345]])

    def move(self, score):
        self.x -= 5
        if self.x == -50:
            self.x = 900
            score += 1

        return score

PROBABLY HERE IS THE PROBLEM

    def collision(self, square, square_hit):
        if square.square_rect.colliderect(self.triangle_rect):
            pygame.event.post(pygame.event.Event(square_hit))

        return square_hit

Here is square (character) class

class Square():
    def __init__(self):
        self.y = 295
        self.vel = 10
        self.square_rect = pygame.draw.rect(WIN, red, pygame.Rect(50, self.y, 100, 100))

    def draw(self):
        pygame.draw.rect(WIN, red, pygame.Rect(50, self.y, 100, 100))

    def jump(self, jumpCount):
        jump = True
        if jumpCount >= -10:
            neg = 1
            if jumpCount < 0:
                neg = -1
            self.y -= (jumpCount ** 2) * 0.5 * neg
            jumpCount -= 0.5
        else:
            jump = False
            jumpCount = 10

        return jump, jumpCount

Here is main game loop

    score = 0
    jump = False
    jumpCount = 10
    triangle = Triangle()
    square = Square()

    run = True
    while run:
        clock.tick(FPS)
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                run = False

            #JUMPING
            if event.type == pygame.KEYDOWN:
                if not jump and event.key == pygame.K_SPACE:
                    jump = True

            if event.type == square_hit:
                pygame.time.delay(2000)

        if jump:
            jump, jumpCount = square.jump(jumpCount)

        triangle.collision(square, square_hit)
        score = triangle.move(score)
        draw_window(square, triangle, score)

    pygame.quit()

if __name__ == "__main__":
    main()