The invention relates to a method for producing a polyvinyl chloride pipe decorated by a cross-linked polyethylene coating. The method includes the following steps: (1) preparing a coating : firstly, adding polyvinyl chloride into decalin, carrying out heating and stirring under the oil bath condition, cooling when complete dissolution is achieved, adding a silane coupling agent KH151 and benzophenone when the temperature is reduced to 40 DEG C-60 DEG C, and then stirring to dissolve the silane coupling agent KH151 and the benzophenone; (2) placing the extrusion-molded polyvinyl chloride pipe into a spraying device, injecting the coating solution into a liquid delivery pipe in the spraying device, and evenly spraying the outer surface of the polyvinyl chloride pipe with the coating solution through an atomizing nozzle in the spraying device; (3) placing the completely-sprayed polyvinyl chloride pipe into an ultraviolet light radiating device, turning on a control switch of the ultraviolet light radiating device to enable an ultraviolet lamp tube to work, and after 5-10 minutes, forming the cross-linked polyethylene coating on the surface of the polyvinyl chloride pipe. The method is simple and easy to achieve.