The invention discloses a cementing device and method for a cloth wrapped silicone rubber product and a space U-shaped component. The cementing device comprises a part bracket, and a big U-shaped frame, a medium U-shaped frame and a small U-shaped frame are all fixed to a bottom frame. The cementing device further comprises a plurality of pressing plates. The medium U-shaped frame is perpendicularly arranged over the small U-shaped frame, and a gap exists between the medium U-shaped frame and the small U-shaped frame. The big U-shaped frame and the small U-shaped frame are arranged in a spacedmanner by a certain horizontal distance. The outer surface of the big U-shaped frame and the outer surface of the medium U-shaped frame are both provided with a plurality of threaded holes at intervals. The cementing method comprises the steps that after the device components are installed and fixed, U-shaped component and pressing plate installation is carried out, the front ends of pressing plates are put on and attached to the cloth wrapped silicon rubber product, the pressing plates sequentially and alternately exert pressure on the cloth wrapping silicone rubber product, and after the cementing process of the cloth wrapped silicone rubber product and the space U-shaped component is completed, U-shaped component dismounting and excessive glue removing are carried out. The cementing device for the cloth wrapped silicone rubber product and the space U-shaped component is simple in structure and convenient to install, the space U-shaped component cemented through the corresponding method has relatively high cementing performance, the excessive glue is removed easily, and machining requirements can be sufficiently met.