A connector clamping device comprises a bottom plate, a concave part and a concave frame are installed on the bottom plate, an air cylinder is installed on the concave frame, a movable plate is installed on the air cylinder, a lower pressing plate is installed on the movable plate and penetrates through the upper end of the concave part, a boss is installed on the bottom plate, a groove is formed in the boss, and the lower pressing plate is located above the boss. A pair of movable penetrating rods are arranged on the concave part in a penetrating mode, clamping plates are arranged at the inner side ends of each pair of movable penetrating rods, inner pushing end plates are arranged at the outer side ends of each pair of movable penetrating rods, inner pressing outer plates are arranged at the upper ends of the inner pushing end plates, inclined holes are formed in the upper ends of the inner pressing outer plates, the lower ends of the inclined holes extend outwards in an inclined mode, and the lower ends of the inclined holes are communicated with vertical holes. A pressing rod is movably arranged in the inclined hole and the vertical hole, a concave connecting piece is rotationally arranged on the pressing rod, and the upper end of the concave connecting piece is installed on the movable plate. According to the utility model, the crimping operation between the connecting line and the connector is facilitated, and the winding drum part can be positioned during the crimping operation, so that the crimping effect is improved.