Disclosed is a pulley device used for glass window automatic flushing device, which comprises outer casing, a balancing wheel rack, a balancing wheel connected with the inside of the balancing wheel rack through a horizontal shaft, the top of the balancing wheel rack is in a shaft shape in rotational connection with the roof of the outer casing, wherein the two left side wheel carrier for mounting the left side protection wheels are fixed on the left upper side wall and left lower side wall inside the outer casing, the two right side wheel protection carriers are mounted on the lower right side wall inside the outer casing, the two right side protection wheels are in fixed arrangement from front to behind, the lower left side protection wheel and the two right side wheels are arranged horizontally, forming a horizontal triangle.

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