A method for fast measuring transformer triangular wiring winding direct-current resistance is characterized by including the steps of firstly, connecting a test loop with a current source to two ends of a to-be-measured triangular wiring winding, and parallelly connecting a ampere meter to two ends of other winding through a switch; secondly, applying the current source to the to-be-measured winding, measuring voltage at two ends of the to-be-measured winding, and simultaneously reading current vale of the parallel ampere meter to determine resistance of the two windings; thirdly, when to-be-measured data is stable, turning on the switch through a control system to skip the parallel ampere meter so as to continue data measuring; and fourthly, when to-be-measured data is stable, calculating to obtain phase resistance of a three-phase resistor after the test. By the method, field test efficiency is improved, test time is saved, and defects can be judged accurately.