The invention discloses a self-locking bearing and relates to the technical field of self-locking bearings. The self-locking bearing comprises a bearing base, a roll ball structure and a bearing cap.The bottom surface of the bearing base is provided with a first annular channel with the arc-shaped cross section. The roll ball structure comprises a roll ball disk. A plurality of through holes areannularly and uniformly distributed in the roll ball disk. Roll balls are mounted in the through holes in a rolling mode. The inner bottom surface of the bearing cap is connected with a fixed plate through a plurality of springs. One end face of the fixed plate is provided with a second annular channel with the arc-shaped cross section. A plurality of arc-shaped grooves are annularly and uniformlydistributed in the second annular channel. The roll ball structure is located in an airtight space formed by the bearing base and the bearing cap. According to the self-locking bearing, the springs are compressed in the matching process of the bearing base and the bearing cap; self-locking of roll balls in the bearing is achieved through fastening of the first annular channel and the second annular channel and matching of the arc-shaped grooves in the second annular channel on the fixed plate and the roll balls; through self-locking and unlocking of the roll balls, the functions of the bearing is added, the utilization rate of the bearing is increased, and the self-locking bearing is easy to operate and convenient to control.