The high-voltage DC circuit breaker based on artificial zero point relies on introducing high-frequency oscillation current to help the main branch break, which requires the fast vacuum switch commonly used in the main branch to have excellent ability to break high-frequency current. However, at present, there is a lack of research content on fast vacuum switches based on coil type longitudinal contacts in the field of breaking high-frequency currents. This article simulates the magnetic field distribution of the gap between 2/3 turn coil type longitudinal magnetic field vacuum contacts under high-frequency current conditions. It is found that the longitudinal magnetic field gradually weakens as the current frequency increases, and it is found that the residual magnetic field after zero crossing of high-frequency currents is not the main factor restricting breaking, The main factor affecting the disconnection is the reverse voltage on the contact gap when the high-frequency current crosses zero. The results indicate that as the current frequency increases, the degree of non-uniformity in the longitudinal magnetic field is higher, so vacuum arc extinguishing chambers based on 2/3 turn coil contacts are not suitable for breaking high-frequency currents.