The invention discloses a cleaning device for internal lens of a projector. The cleaning device comprises a working box, wherein a workbench is fixedly connected to the top of the working box, a groove is formed in the top of the workbench, a cleaning table is movably connected to an inner cavity of the groove, a baffle is fixedly connected to the rear end of the top of the working table, an illuminating lamp is fixedly connected to the top of the front surface of the baffle, a driving device is fixedly connected to the top of the inner cavity of the working box, cleaning device bodies are both fixedly connected to the two sides of the top of the inner cavity of the working box, and the cleaning table comprises a disc. According to the cleaning device, through the cooperative use of the working box, the workbench, the groove, the cleaning table, the baffle, the illuminating lamp, the driving device and the cleaning device, the inconvenience of a traditional manual cleaning mode can beeffectively solved, the lens can be fixed, the lens can be rotated while the cleaning effect is guaranteed at the same time, the cleaning operation convenience of the lens is improved, and the fixingeffect of cleaning on different lens is guaranteed.