Besom lifting device of environmental sanitation motor sweeper

A besom lifting device of an environmental sanitation motor sweeper comprises a motor, a screw rod, a besom and an installation plate. The installation plate is vertically arranged; a first installation hole is formed in the installation plate; the motor is mounted on the installation plate via the first installation hole; the upper end of the motor is provided with a belt wheel; the belt wheel is provided with a belt; the belt is connected with the motor via the screw rod; the besom is mounted on the bottom of the screw rod; the external of the screw rod is provided with a screw rod fixing device; the screw rod fixing device is fixedly connected with the installation plate; and the installation plate is further provided with a second installation hole. By the use of the besom lifting device, the besom can automatically move up and down and great besom structural stability can be guaranteed; an inclination of the bottom of the besom to the ground can be avoided; and great cleaning efficiency can be ensured. 种