The invention discloses an assembly type steering wheel cover, which includes a peripheral box fixedly mounted on a steering wheel of a bicycle. A first vertical rod sleeve and a second vertical rod sleeve are clamped on the vertical part in the middle of the steering wheel of the bicycle, a fastening thread is tightened and then clamped, a horizontal rod sleeve is pushed into a clamping ring andthen stuck with the clamping ring, the horizontal rod sleeve covers the horizontal rod part of the steering wheel of the bicycle, a combination mode is used for covering the steering wheel of the bicycle, brake cables on the steering wheel of the bicycle can be tucked together to be protected, the steering wheel cover is internally provided with certain peripheral equipment such as lighting, assembled parts can be disassembled, and replacement is convenient.