To enhance the sensitivity of fiber Fabry-Perot（F-P）cavity acoustic sensors, a novel racket-shaped cantilever fiber F-P cavity acoustic sensor was designed. First, modal analysis and dimensional optimization of the cantilever were performed using COMSOL simulation software. Subsequently, a racket-shaped cantilever fiber F-P cavity acoustic sensor made of 304 stainless steel was fabricated via laser processing technology, with its machining accuracy verified through microscopic measurements. Finally, an acoustic testing system was established to evaluate the sensor's performance across a frequency range of 20~3 000 Hz. Experimental results demonstrate that the sensor exhibits a resonant frequency of 1 750 Hz, with sensitivity exceeding 350 mV/Pa over the 400~3 000 Hz range. At the operational frequency of 1 400 Hz, the sensitivity reaches 3 619.57 mV/Pa under acoustic pressures of 0.01~0.17 Pa, with a linearity of 0.999 8, a signal-to-noise ratio（SNR）of 49.1 dB, and a minimum detectable pres sure（MDP）of 15.03 μPa/Hz^1/2.