The invention discloses a guided wave radar level gauge cleaning device. The device comprises a fixing seat, a connecting supporting frame, cleaning devices and a driving device, wherein the fixing seat is suitably installed on the head of the guided wave radar level gauge, the connecting supporting frame is fixed to an external structure, the fixing seat is installed on the connecting supportingframe, the supporting pipe is fixed to the bottom of the fixing seat, the supporting pipe is provided with hollowed-out holes, the supporting pipe sleeves the guided wave radar level gauge, the cleaning devices are arranged on the supporting pipe, two groups of the cleaning devices are symmetrically arranged, the cleaning devices are provided with cleaning blocks which can suitably clean the outerside walls of a wave guiding rod of the guided wave radar level gauge, and the driving device is used for driving the two cleaning devices to perform reciprocating movement in the length direction ofthe supporting pipe. The device can be taken as supporting device of the guided wave radar level gauge, the level gauge with certain distance away from the device can be conveniently cleaned, the structure is simple and stable, and the operation is convenient.