The utility model discloses a vibrator device on a conical slag screen of a gasifier. The vibrator device comprises a vibrating air cylinder, an impact rod and a seal sleeve, wherein the vibrating air cylinder is arranged on the surface of the outer wall of the gasifier; one end of the impact rod is connected to a piston rod of the vibrating air cylinder and the other end of the impact rod runs through a seal plate of the gasifier by virtue of the original nozzle of the gasifier; and the seal sleeve sleeves a part of the impact rod between the outer wall of the gasifier and the seal plate of the gasifier. The vibrator device disclosed by the utility model is simple in structure and convenient to use; by installing on the basis of the original structure of the gasifier, the damage on the original device is relieved and normal use cannot be affected, and the manufacturing cost of the device is reduced as well; by striking the conical slag screen through the reciprocating motion of the impact rod under the driving of the vibrating air cylinder, slagging on the surface of the conical slag screen is prevented.