The invention provides a swivel cover mechanism, which comprises a body, a swivel cover in swiveling connection with the body, a tooth structure and a spring piece, wherein the tooth structure is in a disk shape and is fixedly connected with the surface, facing the body, of swivel cover; the spring piece is provided with a meshing part and is fixedly connected with the surface, facing the body of the cover, of the body; the whole circumferential wall of the tooth structure is continuously provided with a plurality of tooth grooves; and the shape and size of the meshing part of the spring piece is meshed with the shape and size of the tooth grooves of the tooth structure in a swiveling mode.