The invention discloses a rectangular double-ridge-waveguide torsional transmission line, and the transmission line comprises at least one input transmission line and one output transmission line, andan electromagnetic channel. The input and output transmission lines are each communicated with one of the two end faces of the electromagnetic channel. The output transmission line is determined by the rotating of the input transmission line around the Z-axis by a certain angle. The input transmission line is a rectangular ridge waveguide, and the electromagnetic channel consists of at least onebranch. At least one of the branches is formed by at least three through holes which are communicated in the Y direction. The torsional transmission line can achieve the wideband compact torsional transition of various waveguides, ridge waveguides, and multi-ridge waveguides. The transmission line is mainly used in various communication and radar systems of microwaves, millimeter waves and terahertz bands.