The invention provides a snow accumulation protection device for a planting greenhouse. The snow accumulation protection device comprises a motor mounting plate, a motor, a sliding block, a screw rod,a connecting plate, a T-shaped connecting block, a semi-circular scraper and a brush. The motor mounting plate is welded and fixed to the upper end of an arc-shaped fixing bracket, the motor is fixedto the upper end of the motor mounting plate by bolts, the screw rod is mounted at the right end of a motor power output shaft through a flange, the sliding block sleeves the screw rod, and the connection plate is welded and fixed to the lower end of the sliding block. The T-shaped connecting block is installed inside the connecting plate in a clamped mode, the semi-circular scraper is installedat the lower end of the T-shaped connecting block, and the brush is adhesively fixed to the lower end of the semi-circular scraper. The brush is arranged outside a plastic film, and the semi-circularscraper is in contact with the plastic film through the brush. The design realizes the snow accumulation protection function of the greenhouse.