The invention discloses a high negative pressure deep-drawing oil well pump and relates to a deep-drawing pump. The pump solves the problem that the existing oil well pump is small in suction force, cannot effectively amplify differential production pressure, the large-diameter oil well pump cannot be applied due to limitation of lifting ability of a ground oil pumping unit, and a yield-increasing effect is not ideal. The pump comprises a pump cylinder and a piston, wherein a reducing mechanism is arranged on a cylinder body of the pump cylinder; the cross section area of an inner channel of the cylinder body above the reducing mechanism of the pump cylinder is less than the cross section area of the inner channel of the cylinder body below the reducing mechanism of the pump cylinder; the piston is provided with an appearance mechanism matched with an inner cavity structure of the reducing mechanism; the cross section area of the piston above the appearance mechanism is less than the cross section area of the piston below the appearance mechanism; the piston is internally provided with a through hole; and the through hole is internally provided with a valve. The pump has the advantages of increased productive capacity, simple structure, convenience in use and maintenance and the like, and is mainly used for oil pumping in an oil field.