The invention discloses an environmentally friendly garbage incinerator. The environmentally friendly garbage incinerator comprises an incinerator body, a feeding barrel, a purifying box and a feeding hopper, wherein the right end of a spiral auger is fixedly connected with a horizontal rotating shaft; a plurality of connecting rods which are arranged horizontally are fixed on the rotating shaft; a scraper blade is fixed at the tail end of each connecting rod; a plurality of shifting plates which are arranged annularly are further arranged on the rotating shaft; a blowing cover is arranged in the incinerator body and faces a water tank; the blowing cover communicates with a second fan; a smoke tube communicates to the inside of the purifying box; a partition is vertically fixed in the middle of the inside of the purifying box; and a side wall of a smoke outlet tube communicates with branch tubes. A motor drives the spiral auger to rotate, so that garbage which enters the feeding barrel is conveyed into the incinerator body, the garbage is fed uniformly, and the stability of incineration is ensured; and meanwhile, the rotating shaft rotates along with the spiral auger, the garbage in the incinerator is pushed aside by the shifting plates on the rotating shaft, therefore, the garbage is uniformly laid on a grate and is combusted, the garbage at the bottom of the incinerator is scooped up by the scraper blades, and the garbage is combusted fully.