The invention discloses a double-inlet and single-outlet submersible 
screw pump oil extraction device, which solves the problems of short bearing service life and the like of the existing submersible 
screw pump oil extraction device. The double-inlet and single-outlet submersible 
screw pump oil extraction device comprises a submersible motor, a planetary speed 
reducer, a screw pump, an oil protector, a thrust coupler, an oil outlet 
check valve and an oil 
pipe line group which are connected in a header 
pipe from top to bottom. The invention has the technical points that the screw pump an upper screw pump and a lower screw pump, wherein the upper screw pump whose delivery capacity is small is provided with an upper 
oil supply hole, and the lower screw pump whose delivery capacity is large is provided with a lower 
oil supply hole; pump rods of the upper screw pump and the lower screw pump whose rotation directions are opposite are hinged with a universal 
coupling; the pump body of the upper screw pump is connected with the oil outlet 
check valve and the oil 
pipe line group, and axial confluence oil discharging holes are respectively arranged in a 
stream guidance body and a 
shunting cover. The invention has optimizing structure, scientific design and reasonable 
stress distribution and matching, has the advantages of the 
mechanical drive device of an electric submersible screw pump oil extraction 
system, effectively improves the service life of the bearing, prolongs the service cycle of the oil extraction device, lowers maintenance cost and obviously improves the working performance of oil extraction and oil output.