Corner connecting structure of cushion

The utility model relates to a corner connecting structure of a cushion. The cushion is formed by splicing a plurality of supporting frames, wherein the supporting frames are formed by connecting a plurality of bracket units which are used for supporting cushion block units. The corner connecting structure is characterized by further comprising a connecting piece for connecting adjacent bracket units on the corners of the supporting frames, wherein the connecting piece comprises bushing pieces which are identical with the adjacent corners in quantity; each bracket unit comprises a supporting pillar, an edge frame surrounding the supporting pillar, and a connecting strip for connecting the supporting pillar and the edge frame; the bushing pieces respectively run through lower side faces of the edge frames of the bracket units on the adjacent corners and are clamped and sleeved on the supporting pillars, so that the bracket units on the adjacent corners are detachably fixed and connected. Therefore, the adjacen