The invention relates to the technical field of production of lithium battery membranes and discloses production equipment for a three-layer co-extrusion membrane of a lithium battery. The equipment comprises an extrusion platform, a first power motor, a second power motor, a first screw extruder, a second screw extruder, a curtain coating platform, a melt pump, a curtain coating machine, a swingdevice, a pulling device, a rolling device, a metal separator and a three-cavity mold. The bottoms of the first power motor, the second power motor, the first screw extruder and the second screw extruder are fixedly connected to the top of the extrusion platform separately, and the output ends of the first power motor and the second power motor are in transmission connection with the input ends ofthe first screw extruder and the second screw extruder respectively. According to the production equipment, the problem is solved that after being extruded, the raw materials are easily moved in different layers. The raw materials are evenly distributed after being extruded by the extruders, the overall raw materials are homogenized, the fluidity of the extruded raw materials can be improved, andthe effect of plastifying the raw materials is improved.