Manufacturing method of LED display module

The invention discloses a manufacturing method of an LED display module. The manufacturing method comprises the following steps of: step a) providing a PCB; b) performing mechanical polishing or/and chemical corrosion on a conductive layer, removing the conductive layer and exposing the surface of an insulating layer; c) coating photoresist on the surface of the insulating layer, and forming a photoresist layer; d) performing pattern exposure and development on the photoresist layer to form a patterned hollow in the photoresist layer; e) performing directional evaporation on the photoresist layer to form a film, and performing deposition on the surface of the photoresist layer and in graphical hollow to obtain a coating layer; f) stripping the photoresist and reserving the coating layer inthe patterned hollow so as to form bonding pads, and conductively connecting the bonding pad with a conductive column; and g) welding the pins of an LED chip to the bonding pads. The position precision and the size precision