A high speed spinning prism Q-switch driven by a brushless direct current (DC) motor (BLDC) has been designed with right-angle reflector in laser diode pumped solid state laser (DPSSL). Some laser pulse series disappear gradually and the number of the output pulses decreases gradually as decreasing the Q-switch shutting period with the increased spinning speed in the experiment, and as increasing the number of the prism to get to high pulse repetition rate, a spinning disk has been designed with 20 prisms, so at the spinning speed of 4.3×104 r/min, the minimum pulse duration is 89 ns, and the repetition rate is 14.3 kHz at the wavelength of 1064 nm. When the pumping power was 795 W, the output peak power of 78.3 kW was obtained at the repetition rate of 20 kHz, and the average output power of 100 W, electro-optic conversion of 12.5% were realized. The preliminary experimental results show that the spinning prism Q-switch as a feasible technology of kilohertz Q pulse plays an important turning-off-ability role in the high repetition rate and high-power DPSSL.