The invention relates to a rocking arm type die-sinking device, which comprises a base, a die holder set and a rocking arm set, wherein the base is provided with a guiding part and a moving part which is arranged on the guiding part in a sliding mode and is guided by the guiding part to perform reciprocating linear displacement between the positions of an inlet seat and an outlet seat; the die holder set is arranged on the moving part, can perform reciprocating displacement between the positions of the inlet seat and the outlet seat along with the movement of the moving part, and is provided with a movable die holder which can be pivoted between the positions of a closed die and an open die along a direction vertical to the displacement of the moving part; and the rocking arm set is provided with at least one rocking arm with a preset length and is pivoted on the base, a pivot of the rocking arm is parallel with and corresponding to the pivot around which the movable die holder rotates, and the rocking arm set is provided with a connected moving part which is connected between the rocking arm and the moving part, and a connecting piece which is arranged on the movable die holder for connecting the rocking arm; thus, when the moving part moves from the inlet seat to the outlet seat, the connected moving part pivots the rocking arm so as to drive the movable die holder to be lifted and turned from the closed die to the open die through the connecting piece.