The invention discloses a U-shaped wood-plastic canal lining and a manufacturing method thereof and belongs to the technical field of hydraulic engineering. The U-shaped wood-plastic canal lining is composed of stiffeners, U-shaped pot-shell-shaped single bodies and anchorage plate. The manufacturing method of the U-shaped wood-plastic canal lining comprises the following steps that (1), a cellulase modifier water solution is sprayed on a wood fiber powder material and talcum powder, and then drying is conducted; (2), the wood fiber powder material and the talcum powder are mixed; (3), polyolefin plastics, polyolefin elastomers (POE), an anti-ultraviolet agent and a compatilizer are mixed, and particle manufacturing is conducted; (4), a mixture of the step (2) is mixed with a particle material of the step (3), and a plasticized particle material is extruded out; and (5), the plasticized particle material is extruded or injected, and the U-shaped wood-plastic canal lining is manufactured. Compared with the prior art, the U-shaped wood-plastic canal lining has the advantages that the service life is long, the water conveying capacity is improved, the water-proof and leakage-proof properties are good, the anti-corrosion and anti-aging properties are good, the structure is simple, dismounting, mounting and conveying are convenient, and the environment-friendly effect is achieved.