Dry-type air-core reactor has the obvious advantages of good linearity, convenient maintenance, non-flammability and non-pollution. It is a reactive power compensation device widely used in long-distance transmission lines. Its operation directly affects the transmission quality of power grid. In this paper, the field-circuit coupling analysis model of dry-type air-core series reactor is established by using finite element analysis software. The distribution of magnetic field, electric field and internal electrodynamic force between turns of the reactor is analyzed and studied by steady-state solution. The distribution law of internal magnetic field, electric field and internal electrodynamic force of dry-type air-core reactor is given. The work in this paper provides a good reference for the optimal design of reactor and the reasonable selection of insulation materials. This work is supported by Key Research and Development Guide Program of Liaoning Province in 2018 (No. 2018020082-201).