The utility model provides a bulk grain unloading machine, which comprises a machine seat (1), wherein a support post (2) is fixedly connected onto the machine seat (1), the top end of the support post (2) is fixedly connected with a cantilever beam (3), a trolley (4) capable of moving on the cantilever beam (3) is arranged on the cantilever beam (3), a connecting rod (5) capable of vertically moving is arranged on the trolley (4), and the tail end of the connecting rod is connected with a dismountable push plate (6). The bulk grain unloading machine has the advantages that equipment is simple, the operation is safe, the cost is lower, and the efficiency is higher.