This study reports on a stable single-frequency active Q-switched Nd∶YVO4 laser end-pumped by a continuous-wave laser diode. The stable high power single-frequency laser output is obtained using reflective Bragg grating (RBG) and etalon. RBG is used as an output coupling mirror and a longitudinal mode selector, combining with etalon to further suppress multiple longitudinal modes, the optical cavity length is increased and high power output is achieved. By optimizing the tilt angle of etalon, the central wavelengths of etalon and RBG can be matched and the insertion loss in cavity can be reduced. Finally, at the physical cavity length of 148.7 mm, a high-power single-frequency laser output with an average power of 750 mW, a pulse energy of 75 μJ at a repetition rate of 10 kHz, and a pulse duration of 8.3 ns is obtained.