Combined mounting seat

The utility model belongs to the technical field of mounting seats, and particularly relates to a combined mounting seat which comprises a base and is provided with an adjusting rod, a transverse plate, positioning rods, a clamping plate, a mounting box, a clamping block, a push-pull rod, a trapezoidal block and the like, when a bearing is mounted, the bearing to be mounted is placed in a mounting cavity, then the two groups of positioning rods are lifted upwards, and the bearing is mounted in the mounting cavity. When the clamping plates are attached to the outer ring of the bearing, the positioning rods are inserted into the positioning holes, then the top of a movable plate is pressed, the movable plate drives a plurality of clamping blocks and pressing strips to move, the clamping blocks extrude trapezoidal blocks, and the trapezoidal blocks are pressed by the pressing strips. When the pressing strip presses the top of the outer ring of the bearing, the movable plate can be stopped from being pressed, lon