Mixing tank stirring device

The utility model discloses a stirring device of a mixing tank. The device comprises a box body and supporting legs arranged at the bottom of the box body, a feeding hole is formed in the top of the box body; a crushing roller group and a first hydraulic cylinder which are respectively arranged in the box body are arranged at the lower part of the feeding hole; the crushing roller group comprisesa left crushing roller and a right crushing roller; the right crushing roller is connected with a piston rod of a first hydraulic cylinder fixed on the outer wall of the right side of the box body; avibrating screen is arranged below the crushing roller set, a stirring mechanism is arranged on the lower portion of the vibrating screen, an impacting mechanism is arranged on the lower portion of the stirring mechanism and comprises a left impacting block, a right impacting block, a second hydraulic cylinder and a third hydraulic cylinder, two fans are arranged on the lower portion of the impacting mechanism, a filter sc