Clamping base and christmas tree

A clamping base, comprising a housing, a supporting body disposed in the housing, and a plurality of clamping members and a locking member that are mounted on the supporting body, wherein

• a placement groove configured to accommodate a placed object is defined in the supporting body, a plurality of sliding grooves are obliquely defined on an inner wall of the placement groove, the sliding grooves extend toward a center of the placement groove from top to bottom, the plurality of clamping members are circumferentially disposed in the placement groove, and sliders capable of sliding along the sliding grooves are disposed on the clamping members;
• and
• the locking member is connected to an upper part of the supporting body;
• a ring-shaped pressing ring is disposed on a top of the locking member, and in a downward moving process of the locking member, the pressing ring is acted on upper end surfaces of the plurality of clamping members to push the plurality of clamping members to slide toward the center of the placement groove to clamp the placed object;
• and an elastic member capable of pushing the plurality of clamping members to return is further disposed between each of the plurality of clamping members and the supporting body.