The invention discloses a technology of making automobile engine cover with carbon fiber reinforcement resin-based composite material, sequentially comprising: cleaning and preparing dies, coating sealant, gluing seal tape, coating mold lubricant, cutting carbon fabric and foam core material, paving and covering carbon fabric and foam core material, paving and covering auxiliary materials, sealing the vacuum section sealed by seal tape, absorbing and injecting resin, and solidifying, demolding and trimming. The making technology of the invention requires relatively short processing period and low labor cost, and is beneficial to both environmental protection and human health. Compared with conventional metal automobile engine covers, the automobile engine cover made of carbon fiber reinforcement resin-based composite material, with equal rigidity, is light in weight, stable in quality, and satisfactory in surface effects.