The invention discloses a motorcycle seat chamber. The motorcycle seat chamber comprises a carrying box and a cushion installed on the carrying box, wherein the front part of the cushion is positioned on the upper part of the carrying box by virtue of a hinge chain, the lower part of the cushion is provided with an enclosure plate corresponding to the inner wall of a cavity of the carrying box, the enclosure plate is provided with guide strips which are protruded and can contact the inner wall of the cavity of the carrying box to realize the guiding. By adopting the motorcycle seat chamber, after the cushion covers the carrying box, the guiding can be realized by virtue of contact between the guide strip and the inner wall of the cavity of the carrying box, so that the cushion and the carrying box are accurately matched and positioned, the dislocation is avoided, and the motorcycle seat cushion is convenient for a user to use.