The invention relates to the technical field of robots, particularly to a robot for cleaning glass. The robot includes a detergentcirculator, an external cleaning device located at the outer side of the glass and an internal driving device located at the inner side of the glass.The external cleaning device includes an inner frame, a cleaning disk assembly and an external magnetic block, wherein the cleaning disk assembly is arranged on the inner frame and attached to the glass wall, and the external magnetic block is embedded on the inner frame. The internal driving device is provided with an internal magnetic block for magnetically attracting an external magnetic block in a para-position mode, and the detergentcirculator is communicated with the cleaning disk assembly through a detergent flexible pipe. According to the robot for cleaning glass, the magnetic-force attraction effect between the external magnetic block and the internal magnetic block is adopted to form an internally-and-externally clamping effect on the glass, it is only needed for cleaners to drive the external cleaning device along the glass to conduct mobile cleaning and washing by moving the internal driving device in rooms, and high risks are avoided when 'spider men' work outdoors at great heights; the robot for cleaning glass also provides a structure basis for reducing the manufacturing cost, the usage cost and the structural complexity of the whole robot.