The invention discloses a compressed natural gas pipe and a preparation process thereof, and belongs to the technical field of natural gas pipes. The compressed natural gas pipe comprises an inner liner layer, wherein a reinforcing layer is arranged on the outer wall of the lining layer, an outer lining layer is arranged on the outer wall of the reinforcing layer, the reinforcing layer is an ultrahigh-strength polyethylene fiber band blank, and the lining layer comprises the following components of 80-90 parts of polypropylene resin, 3-5 parts of drag reducers, 1-2 parts of lubricants, 6-8 parts of plasticizers, 3-6 parts of heat stabilizers and 2-4 parts of accelerants. The polypropylene resin is adopted as a main material of the lining layer, so that the advantages of good mechanical property, non-toxic performance, light weight, corrosion resistance, convenient process, low cost and the like are achieved, the compressed natural gas pipe has the characteristics of strong corrosion resistance, heat preservation, sound insulation and the like, leakage of the natural gas can be effectively prevented, the safety coefficient is improved, the service life is prolonged, moreover, the automation degree of production procedures is high, the production efficiency is high, productivity is large, the defective rate is low, and the labor intensity is reduced.