A construction method of a Lucas simulation model of a current transformer comprises the following steps that S1) a physical experiment model of the current transformer is established by using a magnetomotive force equivalence principle; S2) an initial magnetizing curve and basic physical parameters of the current transformer are obtained via test by a transformer tester; S3) parameters K1, K2, K3, n2 and n3 that reflect the initial magnetizing characteristic curve are obtained from the Lucas model via a genetic and simulated annealing algorithm and the initial magnetizing curve; S4) a hysteresis curve of the current transformer is obtained via a voltage offline integration method; S5) coefficients Ged, G1, G2 and G3 that reflect eddy current and hysteresis loss are obtained from the Lucasmodel via the genetic and simulated annealing algorithm and the hysteresis curve; and S6) K1, K2, K3, n2, n3, Ged, G1, G2 and G3 are integrated to form the Lucas simulation model of the current transformer. The simulation model constructed via the method can simulate transient characteristics of the practical current transformer accurately, and an accurate and proper model basis can be provided for theoretical and simulated analysis of the current transformer.