Dehydration of crude oil is an important step in the production and processing of crude oil. As oil fields enter the high water cut stage of production and the addition of oil recovery additives, dehydration becomes increasingly difficult, so the use of high?frequency electric fields for electric demulsification has become an effective means of dehydration. This article investigates the mechanism of electric dehydration under high?frequency electric field through static dehydration experiments and numerical simulations of droplet electric coalescence. It is found that the electric field strength, frequency, and duration have significant impacts on dehydration efficiency when treating crude oil with electric demulsification and dehydration. In the process of electric demulsification and dehydration, there is an optimal electric field frequency. After the electric field strength increases to a certain value, continuing to increase the electric field strength will actually lead to an increase in water content. After the electric field action reaches a certain time, continuing to increase the electric field action time will result in little change in the water content of crude oil; the greater the electric field strength applied to droplets in the electric field, the more likely the droplets are to deform, and the larger the diameter of the droplets, the more likely they are to deform; compared with the power frequency electric field, droplet coalescence efficiency is higher under high?frequency electric field, and droplets are more prone to coalescence. The research results provide theoretical support for the design and parameter optimization of crude oil electric dehydration units.