The invention discloses a polymer composite material for manufacturing a roller, which is prepared from the following materials in percentage by weight: 35-45% of nylon 6 (PA6), 20-35% of ceramic powder, 15-25% of glass fiber and 3-8% of composite solid lubricant, wherein the composite solid lubricant is prepared by mixing supramoly, graphite and other solid lubricant according to a weight ratio of 1:1-2. After being mixed according to the ratio, all the materials are mixed and extruded by a screw extruder, are subject to water-cooling pelleting, and are processed by an injection molding machine to be molded into a belt roller. The belt conveyor roller made of the composite material combines performance characteristics of polymer materials and ceramic materials, has the advantages of high strength, abrasion resistance, antistatic performance, flame retardance, corrosion prevention, light weight, low noise for high-speed operation, long service life, low price and the like, and can be widely used in industries or fields of smelting, mining, thermal power generation and the like.