The invention provides an adjustable rolling mechanism for rocket bodies of various diameter specifications. The adjustable rolling mechanism comprises a guide mounting table, a supporting frame and a transmission mechanism. A groove is formed in one side of the guide mounting table, the supporting frame can be driven by the transmission mechanism to move along the groove, the supporting frame comprises supporting blocks, V-shaped supporting forks and supporting wheels, one end of each supporting block is connected with the transmission mechanism, the other end of each supporting block is connected with the pointed end of the corresponding V-shaped supporting fork in a hinged mode, each V-shaped supporting fork comprises two fork stems, the top end of each fork stem is provided with a fixing shaft, and the supporting wheels are connected with the fixing shafts in a sleeved mode. According to the adjustable rolling mechanism for the rocket bodies of various diameter specifications, the supporting frame can be adjusted according to practical needs and fixed to the guide mounting table at different set positions and can adapt to different lengths and different diameters of the rocket bodies. Rolling rings are used in cooperation, the degree of damage to the surfaces of the rocket bodies can be effectively reduced, and the function of protecting the surfaces of the rocket bodies is well performed.