The invention discloses an impact type feed system of a methane anaerobic tank. The impact type feed system comprises a feed opening, a pulverizer body, a storage bin, a filter screen, a motor, a crushing mechanism and a feed impact pump, wherein the feed opening is fixed in the top end of the pulverizer body; the storage bin is connected to the side wall of the pulverizer body, and the filter screen is arranged between the storage bin and the side wall of the pulverizer body; the crushing mechanism is composed of a rotating shaft, connecting pieces, a fixed rod and a blade and is arranged in the pulverizer body; the rotating shaft is connected with the motor through a belt pulley, and the connecting pieces are fixed on the surface of the rotating shaft; the connecting pieces are spirally arranged in sequence around the rotating shaft and are connected with the fixed rod, one end, which is far from the rotating shaft, of the fixed rod is connected with the blade, and the feed impact pump is arranged at the feed opening.