Buckle assembly, connecting piece and connector

The invention discloses a buckle assembly which comprises a first buckle piece and a second buckle piece, and the first buckle piece and the second buckle piece are symmetrically arranged. The first buckling piece comprises a first pressing part and a first supporting part, and a first inserting part is arranged at the end, away from the first pressing part, of the first supporting part; the telescopic piece is arranged between the first buckling piece and the second buckling piece, and the telescopic piece is in linear symmetry in the distribution direction of the first buckling piece and the second buckling piece. According to the buckle assembly, the first buckle piece and the second buckle piece are symmetrically arranged, and the telescopic pieces which are linearly symmetrical in the distribution direction are arranged between the first buckle piece and the second buckle piece, so that the buckle assembly can conveniently and uniformly apply force during use, and the buckle assembly can be buckled more