The utility model belongs to the technical field of seat accessories, and provides an
abdomen supporting and adjusting mechanism which comprises a base and an
abdomen supporting piece and further comprises an installation base and a hinge base which are hinged to the base, one end of the hinge base is hinged to the base, the other end of the hinge base is hinged to the installation base, the other end of the installation base is hinged to the base, and the
abdomen supporting piece is installed on the installation base. An air supporting rod is connected between the hinge seat and the base, one end of the air supporting rod is hinged to the hinge seat, the other end of the air supporting rod is hinged to the base, and a release key is arranged on the air supporting rod. According to the abdomen supporting and adjusting mechanism, the base is fixed to the framework of the seat, the release key is pressed during adjustment, then the abdomen supporting piece can be pulled according to needs, the relative angle between the abdomen supporting piece and the base is adjusted, the air supporting rod is synchronously stretched or shortened, after the angle is adjusted, the release key is released, and the length of the air supporting rod is kept unchanged; therefore, the relative angle between the abdomen supporting piece and the base is kept unchanged, the structure is simple and reliable, and adjustment is convenient.