The invention discloses a calibration method, device and system for phasor measurement at both ends of a double-circuit transmission line on the same pole. The method comprises steps that steady-statevoltage and current vectors at both ends of the double-circuit transmission line in normal operation are obtained; steady-state voltage and current same sequence positive sequence components of the double-circuit transmission line and the same sequence positive sequence wave impedance and a propagation constant of the double-circuit transmission line are calculated through a six-sequence component method; the steady-state voltage and current same sequence positive sequence components at both ends of the double-circuit transmission line, and the same sequence positive sequence wave impedance and the propagation constant of the double-circuit transmission line are utilized to calculate same sequence positive sequence voltage phasors at different distances from a head end of the double-circuit transmission line; the step size is set based on steady-state voltage and current phases of the head end of the double-circuit transmission line, non-synchronized phase difference of the measured steady-state voltage and current phases at the end of the line at different distances from the head end of the double-circuit transmission line and actual phases is solved, and an average value of thenon-synchronized phase difference is solved. The method is advantaged in that higher phase correction accuracy can be achieved without synchronous measurement.