The invention discloses a kitchen waste disposer and a kitchen waste treatment method thereof. The kitchen waste disposer comprises a motor, a rotating disc, a first limiting device, a second limitingdevice and a fixing plate, wherein the rotating disc is arranged at the tail end of an output shaft of the motor, the output shaft of the motor is perpendicular to the surface of the rotating disc, an annular sliding groove is formed in the side edge, away from the motor, of the rotating disc, the cross section of the sliding groove is conical, a first positioning hole and a second positioning hole which are symmetrical are formed in the bottom of the sliding groove, the side, far away from the motor, of the rotating disc is provided with the fixing plate, the side edge, close to the rotatingdisc, of the fixing plate is provided with the first limiting device and the second limiting device, the first limiting device comprises a positioning pin, a shaft shoulder, a spring, a first electromagnetic disc, a base and a second electromagnetic disc, wherein the base is of a hollow structure with one end open, one end of an upper opening of the base is installed on the fixing plate, and a guide through hole is formed in the side edge, away from the fixing plate, of the base. According to the kitchen waste disposer and the kitchen waste treatment method thereof, the accuracy of the rotating position of a drying chamber can be ensured, so that falling is accurate, pollution to a box body and repeated drying are avoided, and the efficiency is very high.