The invention provides a manufacturing method of an improved runner plate. According to the manufacturing method, the technical problems that the environmental parameter requirement of an existing production technology is too high, environmental parameters are prone to fluctuating, and product quality consistency is poor are solved. The manufacturing method of the improved runner plate comprises the following steps that a, a to-be-sprayed substrate is placed into a cleaning tank, the interior of the cleaning tank is heated, and air is introduced into the cleaning tank for stirring, wherein thetemperature in the cleaning tank is 88 DEG C, and the cleaning time is 3 min; b, the substrate is immersed into acidic oil removal liquid, and the oil removal time is 2 min; c, the substrate is immersed into clear water, the cleaning temperature is 44 DEG C, and the cleaning time is 4 min; d, the substrate is dried through a drying system, the drying temperature is 62 DEG C, and the drying time is 7 min; e, the substrate is subjected to corona treatment; and f, coating powder is sprayed to the surface of the substrate through a plasma spraying method. The manufacturing method has the advantage of high product quality.