Plastic coated pipe rack (Steel-plastic multiunit rack) is newly developed in the recent years. The product has strong maneuverability, and users can custom scientific and reasonable products as they according to actual needs. The product of Steel-plastic multiunit tubes is a modularized system consisting of plastic coated steel pipe and connecting fittings, wherein, the parts of the connecting fitting are formed by high-quality steels through pressing (it can be divided into various colors). After the surface of the high-quality steel tube is disposed, the outer surface of the wire is integrated by special thermoplastic conglutinant plastic layer, and the inner surface is covered with anti-rust layer, then the wire is produced, which has lots of advantages, such as beautiful outline, abrasion resistant, bright color and luster, rust resistance and no pollution etc. The product has been popularized and trusted in many fields, such as electronic industry, automobile, storage industry, toy industry and medicine industry etc.