Solar street lamp with good drainage performance

The solar street lamp with the good drainage performance comprises a lamp body and an installation sleeve, the lamp body is provided with a light-emitting face and a back face, the edge of the light-emitting face is provided with a plurality of heat dissipation ribs, the heat dissipation ribs can enable heat dissipation of the lamp body to be quicker, the back face is provided with a light-operated sensing installation cavity, and the surface of the light-operated sensing installation cavity is provided with an easily-disassembled plate. A drainage channel and a plurality of drainage channels are arranged on the edge of the back face, the drainage channel is arranged on the outer side of the drainage channel, the drainage channel can discharge water in the lamp volume outwards, connecting pieces are arranged on the two sides of the installation sleeve, fixing holes are formed in the connecting pieces, and the fixing holes can be connected with the surface of a wall through connecting devices. A plurality of t