To provide a wall surface cleaning device capable of operating a polisher for cleaning a wall surface without connecting a power feeding cable to a device main body.

A wall surface cleaning device moving along the wall surface of a building to clean the wall surface is provided with a device main body 1 moving along the wall surface, a polisher 6 disposed at this device main body to clean the wall surface, driving sources 4, 5 and 7 arranged at the device main body for operating the polisher, a solar battery 31 disposed at the device main body, and a storage battery 32 provided at the device main body to be supplied with power from the solar battery for driving the sources 4, 5 and 7.