Slope protection device with warning function

The side slope protection device with the warning function comprises an inner infrared sensor and an outer infrared sensor, a warning protection unit is arranged between the inner infrared sensor and the outer infrared sensor, and the warning protection unit comprises a left stand column, a right stand column and a motor. A reel is arranged between the upper supporting plate and the lower supporting plate, a gear is connected to the upper end of the reel, a worm meshed with the gear is connected to the motor, a driving bevel gear is connected to the lower end of the reel, a sliding rail is arranged between the left stand column and the right stand column, and a lead screw is arranged in the sliding rail. A driven bevel gear meshed with the driving bevel gear is arranged at one end of the lead screw, a sliding rod is connected to the lead screw in a threaded mode, protective cloth is wound around the reel, the outer end of the protective cloth is fixedly connected with the sliding rod, and a clamping groove fo