Simple jacking plate prior withdrawing device of injection mold

The invention discloses a simple jacking plate prior withdrawing device of an injection mold. The device comprises a rotating arm push block (1), a fixed push block (2) and a support block (3). The device consisting of the components is arranged on an outer wall surface of one same side of the injection mold; a shifting column which protrudes backwards and takes the shape of a cylinder is arranged at the lower end of the rotating arm push block; the upper end of the rotating arm push block is in rotational connection with a moving mold carrier plate; the fixed push block is positioned on the right side of the rotating arm push block and is connected with the fixed mold carrier plate; the support plate is positioned on the right side of the fixed push block and is connected with a moving mold carrier plate; the shifting column is clamped above the edge of a jacking plate; when the mold is closed, the right side surface of the shifting column is in sliding contact with the fixed push block; when the mold is ope