The invention provides an automatic washing device suitable for interior of a machine tool. The automatic washing device comprises a cover body, a pedestal and an exhaust fan. The pedestal is provided with a first wall body, the cover body is arranged on the first wall body, a dust collection cavity is defined by the cover body and the first wall body, and the cover body is provided with a suction opening which communicates with the dust collection cavity. The pedestal is further provided with an installation part which is located in the dust collection cavity and used for installing a cutter. The pedestal is further provided with a dust collection hole which penetrates the pedestal and communicates with the dust collection cavity, and the dust collection hole is provided with a first end portion and a second end portion. The first end portion penetrates the first wall body and is located in the dust collection cavity. The second end portion is connected with the exhaust fan. The chipping washing rate of the automatic washing device is high, and the environmental safety, cleanliness and tidiness are kept.