The invention discloses a disinfection device for a livestock farm. The disinfection device comprises a box body, a fixed base is fixedly connected to the left side of the bottom of the inner wall of the box body, a motor is fixedly connected to the top of the fixed base, a worm is fixedly connected to one side of a motor output shaft, an axle base is fixedly connected to the side, away from the motor, of the fixed base, a conveying shaft is rotatably connected to the center line of the axle base, a worm gear is fixedly connected to the portion, located between the two axle bases, in the middle of the conveying shaft, the worm is connected with the worm gear in a meshing mode, the conveying shaft is in drive connection with a movable device through a gear, a rotary sleeve is rotatably connected to the movable device, a water tank is fixedly arranged in the box body, a high pressure pipe is communicated with the water tank through a high pressure pump, and a high pressure spray nozzle is fixedly connected to the end, extending outside the box body, of the high pressure pipe. The invention relates to the technical field of breeding machinery. According to the newly established spraying device for a pavement, by making the motor drive a driving wheel to rotate and a high pressure spray nozzle to rotate in a reciprocating mode, the problem of traditional manual disinfection is solved, the disinfection efficiency is improved, and the labor intensity is lowered.