The invention discloses an agaricus bisporus root cutting machine. The machine comprises a rack, wherein two gears are axially connected with the rack, a drive motor is connected with the lower side of an arbitrary gear; a chain is connected between the two gears, and comprises chain plates which are connected end-to-end by chain pins; rolling rings are connected outside the chain pins in a sleeving manner; a socket base is arranged inside the chain plates; an arc clip is arranged inside the socket base; and a cutter is arranged on the rack, is positioned above the chain, and is arranged in parallel to the roof of the chain. The agaricus bisporus root cutting machine can overcome the defect in the prior art, and realizes quick root-cutting operation of agaricus bisporus.