This paper proposes and demonstrates a method to produce narrow-linewidth, narrow-pulse-width, and high-repetition-rate pulses with actively Q-switched ring-cavity all-fiber lasers based on acoustic-optic modulators. We use a double-clad gain fiber as the cladding power stripper's input fiber in the ring cavity to shorten the cavity length and reduce reflections from the forward amplified spontaneous emission (ASE) at the output end of the gain fiber, which can efficiently suppress the ASE gain self-saturation so that the effective cavity gain can be enhanced. The narrow-linewidth Q-switched laser pulse can be established quickly, providing a narrow pulse width and high repetition rate for the pulses. Our experimental results demonstrate that the laser can produce 150-kHz Q-switched laser pulses with a narrow linewidth and pulse width of 0.16 nm and 10.4 ns, respectively, at a pump power of 7 W.