The invention discloses a mould clamping tool, and relates to the technical field of tool clamps. The mould clamping tool comprises a base, a placing table used for placing a mould is arranged on thebase, mounting grooves are arranged in the placing table, the placing table comprises clamping block used for clamping the mould, a sliding block is slidably connected in the mounting grooves, the sliding block is matched with the clamping block, a driving piece used for pushing the sliding block to slide towards one side of the clamping block is arranged on the base, and the driving piece is usedfor pushing the sliding block to be matched with the clamping block to clamp the mould, and auxiliary clamping pieces are arranged on the two sides, adjacent to the driving piece, of the mounting groove in the base. According to the mould clamping tool, the mould can be clamped and positioned in the using process of the mould, so that the position of the mould is stable and firm, different specifications and types of molds can be correspondingly installed, the overall application range is wide, and the application area is wide, meanwhile, the mould can be well fixed, and the stability of themould in the machining process can be kept.