The invention relates to the technical field of garbage disposal, in particular to an environmentally friendly smokeless treating device for garbage burning. The device comprises a bottom plate, a feeding hopper is fixedly installed on the upper portion of one side of a smashing box body, and supporting plates are fixedly installed on the two sides of the upper surface of the smashing box body; atop plate is jointly connected with the upper ends of the supporting plates, the lower end of a first rotary shaft penetrates through the smashing box body, and a plurality of smashing cutters are installed on the two sides of a stirring rod; a uniform discharging plate is installed on the upper portion of the inner side of a burning shell body, a plurality of mixing devices are fixedly installedon the two sides of a second rotary shaft at equal intervals, and an output shaft of a fourth motor is connected with an intermittent transmission device; a filtering shell and an exhaust fan are arranged in the middle of the upper surface of the bottom plate, and the upper portion of the left side of the filtering shell is connected with the smashing box body through an air guiding pipe. The device is simple and novel in structure and convenient to use, can greatly improve the garbage disposal efficiency, has a significant garbage disposal effect, and is worthy of using and popularization.