Abstract: Electromagnetic heating unplugging is widely used in the fields of oil storage and transportation, as well as chemical material transportation. In practical applications, due to the unsuitable configuration of multi-physical coupling field parameters, the pipeline unplugging efficiency is reduced, the production cost is increased, and the production schedule is delayed. A finite element model of magnetic-heat flow coupling fields was established using COMSOL, and the numerical simulations of multi-physical field coupling characteristics were conducted, and the experimental verification of oil pipeline heating unplugging with controlled frequency was performed. The results show that as frequency increases, the skin depth decreases, which causes the eddy current electric field and Joule heat to primarily concentrate on the pipeline surface, thereby enhancing the skin effect. The error between the simulated and theoretical values of the skin depth is less than 7.1%. During the pipeline heating unplugging experiment, the viscosity reduction rate increases with the increase of the frequency and excitation current. However, the viscosity reduction effect decreases due to the effects of skin effect, magnetic saturation and viscosity reduction rate. When the frequency is 20 kHz and the excitation current is 14.5 A, the effect of viscosity reduction and unplugging is remarkable, and the viscosity reduction rate of crude oil is 50.3%. The experiment results provide a theoretical foundation for optimizing the electromagnetic heating unplugging parameters of crude oil pipeline in actual production.