The invention discloses a self-propelled compost aerator and belongs to the field of edible fungus production equipment. The compost aerator is applicable to manufacture of composts for edible fungi and organic fertilizers. The technique of the aerator is as follows: a motor, a transmission shaft, a gear box, a chair for a driver, an operating rod and a steering wheel are arranged on a machine body consisting of a machine frame and a machine shell, wherein the machine body is provided inside with a raking mechanism and a compost conveying mechanism. A tail end of the raking mechanism is arranged above a starting end of the compost conveying mechanism. A belt wheel is arranged on a shaft of the motor and has a belt for connection with the transmission shaft. The transmission shaft is connected with a belt wheel arranged on a shaft of the gear box. The gear box is provided with an output shaft which is provided with a chain wheel. The chain wheel has a chain for connection with a chain wheel arranged on a shaft of walking wheels. The transmission shaft has a belt wheel for connection with the compost conveying mechanism. The compost conveying mechanism has a plurality of pairs of chain wheels which are provided with chains. A shaft of the raking mechanism also has the same number of chain wheels which are also provided with the same number of chains. The compost aerator has the advantages of combining material raking and aerating and composting, and saving time and labor, and is applicable to large scale production of fungi.