The invention belongs to the field of covering slag flow adjusting devices in the metallurgical industry, and in particular, discloses a powder material flow adjuster. The powder material flow adjuster comprises a box and a support plate, wherein an elastic part is arranged between the support plate and a baseplate of the box; a pressing rod is arranged on the bottom surface of the support plate; a support rod is arranged on the baseplate of the box; a lever is arranged at the upper end of the support rod; a feed hole, a first discharge hole and a second discharge hole for mounting a pressure sensor are formed in the side wall of the box; an alarm electrically connected with the pressure sensor is mounted on the side wall of the box; the second discharge hole is formed below the first discharge hole; a chute is formed in the side wall of the box; a baffle plate for controlling an opening quantity of the first discharge hole is arranged in the chute; one end of the lever is positioned rightly below the pressing rod; and the other end is hinged to the baffle plate.