The invention relates to a
microwave photocatalytic device for degrading
wastewater and being capable of keeping high treatment efficient continuously, and belongs to the technical field of
wastewater treatment. In the conventional
microwave photocatalytic degrading technology for the industrial
wastewater containing organic contaminants, the outer lateral surface of a
quartz tube for shielding a non-polar
ultraviolet lamp in a device is soaked in wastewater liquid for a long time so as to generate a scale phenomenon, the permeability of the
quartz tube about the
ultraviolet light is seriously influenced due to the existence of the scale layer, and the treatment efficient of a
microwave photocatalytic reaction device is greatly reduced. The microwave photocatalytic device aims at solving the problem. According to the invention, an ultrasonic
transducer provided with a cage-shaped
microwave shielding cover is arranged on the inner lateral surface of the sidewall of a microwave photocatalytic reactor, on the premise of not stopping and not disassembling, the scale on the outer lateral surface of the
quartz tube is instantly ultrasonically cleared through ultrasonic conveyance of a
liquid medium, therefore the high permeability of the quartz tube about the
ultraviolet light is kept, and the continuous high efficiency of the microwave photocatalytic degrading reaction device is maintained.