Support pressing and holding device

The utility model relates to the technical field of support pressing and holding, and discloses a support pressing and holding device which comprises a base module, a clamping module is arranged at the upper end of the base module, a rotating module is fixedly installed at the upper end of the base module, a pressing and holding module is arranged on the inner side of the rotating module, and the pressing and holding module is rotationally connected with the rotating module. According to the support pressing and holding device, a handle is manually rotated to drive an inner fixing ring to rotate, the inner fixing ring rotates along an outer fixing ring, the position of the inner fixing ring is limited through a baffle, pressing and holding knives are limited through sliding connection of sliding blocks and sliding grooves, and the multiple pressing and holding knives rotate to press and hold a catheter in a pressing and holding hole; the nitrogen tank is opened by starting the air cylinder for shaping, the gu