A multifunctional environment-friendly garbage combustion treatment device system comprises a hearth frame, a hearth, a drawer, a material scatterer, a smoke backflow box, a feeder, a worm wheel powergeneration device and a water mist smoke remover. The hearth is fixed in the hearth frame, and the outer portion of the hearth is provided with a hearth cover. A water storage cavity is formed between the hearth cover and the peripheral face of the hearth. The drawer is used for collecting ash. The material scatterer is fixed into a smoke outlet of the hearth and used for scattering falling garbage through impacting. The smoke backflow box is connected with the smoke outlet of the hearth. The feeder is fixed to the left end of the smoke backflow box. Smoke discharged through the hearth and steam generated through water heating are used for power generation of the worm wheel power generation device, and smoke discharged through the worm wheel power generation device is purified through thewater mist smoke remover and then discharged into the atmosphere. The multifunctional environment-friendly garbage combustion treatment device is high in garbage incineration speed, high in heat value recycling, diverse in function and intelligent, and the purposes of low running cost, high yield and green ecology are achieved; and the combusted smoke is subjected to secondary treatment, and environment friendliness is facilitated.