The invention discloses a control system for precise machining of forklift supporting racks. A plurality of machining grooves which extend in the direction of a rotary shaft and are used for containing the forklift supporting racks are formed in the surface of a supporting roller. A machining unit set installed on a rail is arranged above the machining grooves. During machining, when a first sensor detects that the position deviation of the supporting racks in the machining grooves is smaller than a preset threshold value and a second sensor detects that the machining grooves are located in a machining station, a control device controls machining units to work; switching of machining stations on the supporting roller is achieved through the rotation of the supporting roller, and automatic feeding, machining and discharging are achieved. According to the control system for precise machining of the forklift supporting racks, the structure is simple, the design is reasonable, the forklift supporting racks of different dimensions and different punching positions can be machined according to requirements, and automatic machining of the supporting racks is achieved, so that the machining efficiency is greatly improved.