The invention relates to a biscuit coating device. The biscuit coating device comprises a charging cylinder. The outer side of the charging cylinder is provided with an electric heating belt. A thermal insulation layer is arranged outside the electric heating belt. A discharge pipe is inclined below the charging cylinder. A flat tube is connected to the lower part of the discharge pipe. A coatingroller wheel is arranged below the flat tube. A conveyor belt for conveying a biscuit blank is arranged below the coating roller wheel. Two sides of the conveyor belt are provided with supports. The supports are provided with a baffle plate. A recovery pipe is arranged above the front end of the baffle plate. The recovery pipe is connected to a suction pump through a suction pipe. The biscuit coating device has a simple structure and a novel and reasonable design, is easy to operate, effectively coats the blank and realizes a low preparation cost.