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Aiming at the problem of voltage tracking control for Buck DC-DC converters, a finite-time controller based on event-triggered is proposed. Firstly, the Buck converter is modeled as a class of feedback nonlinear system. Then an event-triggered scheme is designed to avoid unnecessary waste of communication resources effectively by constructing a coordinate transformation. At the same time, a state-feedback controller which is dependent on triggering instants is designed by using backstepping. Then, based on the proposed event-triggered controller, the stability of the closed-loop system is analyzed by using finite-time Lyapunov stability theory and the Zeno phenomenon which could be accused from the event-triggered scheme is also excluded. Finally, the effectiveness of the proposed event-triggered finite-time control scheme is verified by a simulation example about the Buck converter and simulation results show that the proposed control method can make the output voltage of the Buck DC-DC converter reach the prescribed voltage in finite time and the waste of communication resource can be reduced at the same time.