The utility model belongs to metal owner paddle assembly field, concretely relates to pressure annunciator's mounting tool. In the production and repair process of metal owner paddle, the installation that often involves pressure annunciator is dismantled, and pressure annunciator housing material is breakable, need use laminating pressure annunciator's specialized tool in the installation. The utility model discloses a pressure annunciator's mounting tool, the installation of the sealing region of metal owner paddle with dismantle pressure annunciator, constitute by special spanner head and movable jaw, wherein the special spanner head is whole to be the U -shaped structure, has the installation at both ends the screw hole of movable jaw, this movable jaw has the lug that inserts pressure annunciator both sides mounting hole. Adopt this pressure annunciator mounting tool, need not dismantle spring pressing piece, alright with direct manual installation pressure annunciator's specialized tool, improved work efficiency greatly, reduced workman's the operation degree of difficulty, also improved pressure annunciator's installation quality.