To expand the application range of all-solid-state single-frequency lasers and achieve high-power single-frequency laser output, this study uses dual piezoelectric ceramics (PZT) resonant detection combined with a variable reflectivity unstable cavity and side pumping module composed of a laser diode (LD) array to develop an all-solid-state, electro-optical, Q-switched, and single-frequency pulse laser with a repetition frequency of 100 Hz. This study achieves a stable, high-beam quality, high-power, and narrow-linewidth laser output. The experimental results show that when the oscillator cavity length is 300 mm, the repetition frequency is 100 Hz, pump current is 160 A, and pump pulse width is 300 μs. Thus, a stable, narrow-linewidth laser output with an average power of 10.06 W is achieved, corresponding to a pulse width of 6.6 ns, linewidth of 93.874 MHz, and beam quality factor of M${}_x^{\mathrm{2}}$= 1.510, M${}_y^{\mathrm{2}}$= 1.674. The laser can be used as a stable, narrow-linewidth pulse laser light source for detection equipment, such as Doppler wind radars.