The invention provides a multiport impedance model construction method based on living body electric shock impedance parameter calculation. The multiport impedance model construction method comprises the following steps: collecting multiple groups of low-voltage power distribution network living body electric shock signals of a living body test object under situations of complete skin and broken skin; according to the living body electric shock signals, obtaining a living body electric shock impedance parameter; according to the living body electric shock impedance parameter, utilizing a nonlinear time varying resistor and a capacitor element to establish a test living body electric shock impedance circuit model, and describing the transient state transition process of the living body electric shock; and according to the living body electric shock impedance circuit model, on the basis of an extrapolation method, obtaining the multiport impedance model of the living body electric shock. The method can calculate the living body electric shock impedance parameter and establish the multiport impedance model, which has high response accuracy, of the living body electric shock, and realizes the precise description of the transient state transition process of the living body electric shock under the power frequency situation of the low-voltage power distribution network.