The invention relates to a multifunctional street lamp. The multifunctional street lamp comprises a lighting component, a supporting component and a cleaning component. The lighting component is fixed to the supporting component. The cleaning component is arranged in the supporting component and connected with the lighting component. The lighting component comprises a glass lens, an LED bulb and a lampshade. The LED bulb is arranged in the lampshade. The glass lens is located at the lower end of the lampshade, and the glass lens and the lampshade form a closed space. The cleaning component comprises water outlet nozzles, an arc-shaped bent plate, a connecting rod, a flexible water conveying pipe, an electric motor, a high-pressure water pump and a PLC. The water outlet nozzles are distributed on the surface of the arc-shaped bent plate. The arc-shaped bent plate is connected with the flexible water conveying pipe. The electric motor is arranged in the lampshade. The flexible water conveying pipe is placed in a lamp post and connected with the high-pressure water pump. The high-pressure water pump is arranged in a base of the street lamp. The arc-shaped bent plate is hollowly designed. A hole is reserved in the middle of the arc-shaped bent plate and connected with the flexible water conveying pipe.