The invention discloses a robust power transmission line positive sequence parameter identification method. The robust power transmission line positive sequence parameter identification method comprises steps that phasor measuring devices disposed on two ends of a single circuit power transmission line are used to measure the three-phase current and the voltage phasor of the two ends of the line; the calculation equation of the line impedance parameter and the admittance parameter is established according to a single circuit power transmission line three-phase equivalent model and by combining with the three-phase current and the voltage phasor of the two ends of the line; a Huber estimation target function having a robust capability is constructed to be used as the target function identified by the line impedance parameter and the admittance parameter, and therefore a line impedance matrix and an admittance matrix parameter are acquired; by adopting a method of symmetrical components, the line impedance matrix and the admittance matrix are decoupled to acquire positive sequence impedance and a positive sequence admittance parameter. The robust power transmission line positive sequence parameter identification method is advantageous in that operability is strong, and implementation is easy; the precision of the positive sequence impedance parameter acquired by identification is high; the good robust capability is provided, and identification results are more credible.