Aiming at the chemical crystallization production process,a new type of automatic striking device for chemical crystal tank was designed to solve the problem, that crystallized product was separated from crystal tank wall depending on manual work. Combined with the existing production process, a program was identified to imitate blanking of people hitting the tank.The whole frame of the device was supported on the top of the tank body and the rack body was driven to rotate around the tank body by drive wheels. The lifting mechanism drove the hammer body to move up and down. In the electric control system, PLC & touch screen control method was adopted to realize automatic hitting to the tank surface.The impact force and structural parameters of the hammer were analyzed and calculated, and the structure of the hammer was optimized under the condition of ensuring sufficient punching force. In the actual production application, it meets the anhydrous aluminum trichloride production requirements, which provides a reference for the design of other similar products.