Abstract: With the increasing number of non-linear devices such as electric vehicle home charging piles and photovoltaic inverters, the harmonic pollution of the power system is becoming increasingly serious. In order to analyze the continuous operation capability of dry-type air-core reactor under harmonic disturbance, finite element simulation software is used to establish an equivalent model and carry out field-road, fluid-temperature field simulation calculations. The influence law on coil loss and package temperature rise in the presence of high harmonic disturbances in the reactor terminal voltage is analyzed, and the temperature rise of the reactor is limited by installing heat dissipation fans and sheets. Research shows that the harmonic frequency of the reactor terminal voltage increases, the coil resistance increases, the current decreases, and the resistance loss decreases. The eddy current loss is positively correlated non-linearly with the frequency variation. The increase in total loss indirectly leads to an increase in the overall operating temperature of the reactor, and the overheating problem of the reactor can be effectively solved by installing cooling fans and heat sinks. The study may provide a reference for the design of healthy operation of dry-type air-core reactor in high-harmonic polluted environments.