The invention discloses a step continuous pressure reduction synergistic oil pumping device and method. The device comprises at least three pressure reduction devices which are sequentially connectedin series from bottom to top; the flow speed in the bottommost pressure reduction device is minimal, and the flow speed in the uppermost pressure reduction device is maximal, that is, the flow speedsin the pressure reduction devices which are connected in series together are gradually and sequentially increased from bottom to top; the upper end outlet of the uppermost pressure reduction device isin screw threaded connection with the lower port of a pump cylinder of the pump; and the lower end inlet of the bottommost pressure reduction device is connected with a fixed valve of an oil pipe. The device and the method have the advantages that the step continuous pressure reduction is realized, the liquid phase content is increased, and the pump efficiency is improved; and the pressure reduction devices are connected in series, and the flow speeds in the pressure reduction devices are sequentially increased from bottom to top.