The invention discloses a movable mold support seat of an injection mold, which comprises a rack, a plurality of ejection pin units capable of being moved and adjusted on a vertical horizontal plane,and a movable mold connecting device, wherein the ejection pin units are arranged on the right end face of the rack and comprise ejection pin bodies capable of being adjusted right and left; and the movable mold connecting device is arranged on the rack and comprises a movable mold connecting rod arranged in a right and left sliding manner. The positions of the ejection pin bodies on the verticalplane are adjustable; the support seat adapts to ejection actions of forming workpieces of different movable molds; the position in a right and left direction is adjustable; ejection strokes of ejection pins can be controlled, so that ejection of the ejection pins to an inner cavity of a static mold can be avoided; ejection positions of the workpieces can be adjusted; and subsequent procedures arefacilitated.