The principle of reinforcing the fiber web by the spunlace method is similar to that of the needle punching process, but instead of the needle, the multi-strand fine water jet generated by the high pressure is used to spray the fiber web. After the water jet passes through the fiber web, it is rebounded by the supporting net curtain and is again inserted into the fiber web. Thereby, the fibers in the fiber web are displaced, interspersed, entangled and cohesive under the action of the high-speed water jet interspersed in different directions, thereby The web is reinforced.