The invention discloses buckles used for a universal support of automobile seats. The universal support comprises a fixing seat which is arranged below a headrest of the seat and connected with display equipment, the buckles are arranged inside the fixing seat, sliding grooves are formed in the buckles, sliding rails matched with the sliding grooves are arranged on the fixing seat, the buckles are connected to the sliding rails in a clamped mode through the sliding grooves, the buckles clamp headrest supporting rods through the front ends, when the universal support is installed, the buckles slide along the sliding rails to the positions of the headrest supporting rods and clamp the headrest supporting rods, and the fixing seat is fixed below the headrest. By means of the sliding design of the buckles, the buckles are capable of adapting to the intervals of different headrest supporting rods and the headrest supporting rods of different specifications, it is guaranteed that the support can be installed effectively on different types of automobiles, the universality of the support is strengthened, the original method that a kind of support is customized according to a kind of automobile is avoided, the production cost is reduced, the buckles are simple in structure, the tightening degree is convenient to adjust, the stability of the support is good, the headrest supporting rods are prevented from abrasion by the buckles, and the broad market prospect is achieved.