The invention discloses a molded line of a rotor of a double screw rod compressor, and relates to the technical field of double screw rod compressors. A female rotor tooth molded line and a male rotortooth molded line are each formed by smoothly connecting seven curves end to end. The molded line solves the problems that the number of times of engagement lines of an existing compressor rotor molded line can only reach up to two times, large pneumatic losses appear in the compressor operation process, and meanwhile the result generated after adjusting is hard to predict. The curves of each rotor tooth molded line comprise B splines, arc curves and a point-cycloid curve, wherein the B spline A2B2 and the B spline B2C2 are tangent at the point B2, the B spline B2C2 and the B spline C2D2 aretangent at the point C2, the arc D2E2 is tangent to the arc E2F2, the arc D2E2 and the B spline C2D2 are tangent at the point D2, the arc D2E2 and the arc E2F2 are tangent at the point E2, and the point-cycloid curve engagement manner is adopted by the F2G2 segment. The molded line is used for the double screw rod compressor.