2 μm laser, which is always used as the pump source of mid-infrared OPO, plays a significant role in manufacture and scientific research. Bulk oscillator using Ho³⁺ doped crystal is the main method to produce high-power 2 μm laser beam. A high power Q-switched Ho∶YAG oscillator pumped by a Tm³⁺-doped fiber laser is presented. The maximum continuous output power of 36.1 W with a slope efficiency of 61.4% is achieved at the wavelength of 2090 nm. In the Q-switched regime, 33.6 kW peak power and 72 ns pulse width are obtained at the pulse repetition frequency of 15 kHz. This oscillator contains a single Ho∶YAG crystal which makes it compact and suitable for integration.