The invention relates to a high-coupling split reactor modeling method and device, computer equipment and a medium. The high-coupling split reactor modeling method comprises the following steps: establishing an ideal coupling reactor sub-model; determining a fourth-order admittance matrix of the high-coupling split reactor according to the frequency characteristic parameters of the four ports of the high-coupling split reactor in the preset frequency range; determining a fourth-order admittance matrix of the ideal coupling reactor sub-model; determining a fourth-order admittance matrix of thehigh-frequency module submodel according to the difference between the fourth-order admittance matrix of the high-coupling split reactor and the fourth-order admittance matrix of the ideal coupling reactor submodel; according to the fourth-order admittance matrix of the high-frequency module sub-model, adopting a four-port pi-shaped equivalent circuit, and obtaining the high-frequency module sub-model through image method fitting; and connecting the high-frequency module sub-model with the ideal coupling reactor sub-model in parallel to obtain a high-coupling split reactor model. The high-coupling split reactor modeling method provided by the invention is high in accuracy.