Soluble bridge plug

The invention provides a soluble bridge plug and relates to the technical field of petroleum exploration. The technical problem is solved that common bridge plugs in the prior art easily cause damageto the inner walls of shaft casing pipes during anchoring. The soluble bridge plug comprises a central pipe, and the central pipe is sleeved with a locking ring cap, an upper locking ring, a sealing assembly, a conical body, a slip, a lower locking ring and a guide shoe part; a first unidirectional locking structure is arranged between the upper locking ring and the central pipe; a second unidirectional locking structure is arranged between the lower locking ring and the central pipe; a third unidirectional locking structure is arranged between the guide shoe part and the lower locking ring; the locking directions of the first and third unidirectional locking structures are both in the axial direction of the center pipe and away from a guide shoe direction, and the locking direction of thesecond unidirectional loc