The invention provides a screw rotor journal bearing outer circle machining technology, and belongs to the technical field of bearings. The screw rotor journal bearing outer circle machining technology is characterized by comprising the following steps that firstly, burdening is conducted, a material pipe is subjected to acid pickling treatment, then, the surface layer of the material pipe is cut,then, a bar is cropped, and a bearing outer circle blank is obtained; secondly, forming is conducted, the bearing outer circle blank is placed in a heating furnace to be heated, the heating temperature is 300-350 DEG C, the heating time is 30-40 min, and finally, cooling is conducted to the room temperature; thirdly, slotting is conducted, and an arc groove face is formed in the inner circle of the bearing outer circle blank in the second step; fourthly, first-time grinding is conducted, the bearing outer circle blank in the third step is placed on a grinding device to be ground, and the inner surface, the outer surface and the groove face of the bearing outer circle blank are ground to be smooth; fifthly, chamfering is conducted, and the edge of the bearing outer circle blank is subjected to right angle chamfering; sixthly, second-time grinding is conducted; and seventhly, checking is conducted. The screw rotor journal bearing outer circle machining technology has the advantages thatthe bearing outer circle treatment speed is high, and the effect is good.