The invention discloses a smokeless garbage incinerator. The smokeless garbage incinerator comprises a storage box, an outer cylinder is connected to one side of the storage box, a crushing box main body is arranged on the storage box, the crushing box main body and the outer cylinder are connected through a material leaking pipe, a vibrator is arranged on the material leaking pipe, an ash accumulating cylinder is arranged on one side of the outer cylinder, a gas pretreatment cylinder is arranged on one side, far away from the outer cylinder, of the ash accumulating cylinder, a purification cylinder main body is arranged on one side of the gas pretreatment cylinder, a backflow gas inlet pipe is arranged on the purification cylinder main body, the crushing box main body and the purificationcylinder main body are connected through the backflow gas inlet pipe, the outer cylinder is obliquely arranged, an auxiliary fan and an exhaust gas burner are arranged in the gas pretreatment cylinder. According to the smokeless garbage incinerator, garbage is classified firstly and then crushed, so that the crushing efficiency and the crushing speed are increased, follow-up incineration is facilitated, the incineration rate and the incineration effect are improved, and a purification device is further arranged, and is used for carrying out purification treatment and reutilization treatment on the discharged air flow.