The invention discloses a soluble bridge plug which comprises a central pipe, a rubber cylinder, a protective ring, an upper split ring, a lower split ring, a threaded ring, a cone, a snap ring, a slip, wear-resistant particles, slip inserts, a lower body and a lower positioning block. The defects in the prior art are overcome; in the whole structure, except the rubber cylinder, the slip inserts and the wear-resistant particles, other parts are all made of a soluble magnesium alloy material, and the rubber cylinder is soluble and can be gradually dissolved in a certain solution environment, until the whole bridge plug is completely dissolved, subsequent underground construction is normally carried out, and the construction time and cost are saved; and in addition, compared with a conventional bridge plug structure, the soluble bridge plug is simple in structure, few in parts and small in size, and the dissolving time is greatly shortened.