The utility model provides a feeding device for a garbage incinerator. The feeding device comprises a feeding platform and a feeding trolley which is positioned above the feeding platform, wherein the head part of the feeding trolley is equipped with a feeding trolley fire grate segment sliding on the feeding platform; a groove is formed in the bottom surface of the feeding trolley fire grate segment; a raised guide rail is arranged on the feeding platform; the feeding trolley fire grate segment is buckled on the raised guide rail through the groove. According to the feeding device disclosed by the utility model, a guide device is designed on the head of the feeding trolley, so that the feeding trolley is guaranteed to be straight in a material pushing process, and the feeding trolley is further prevented from being blocked. The feeding device is simple in structure, convenient to mount and low in cost. The utility model further discloses the garbage incinerator.