The active fiber grating hydrophone with high sensitivity and anti-acceleration is investigated. The λ/4 phase-shift Er3+-doped fiber grating is used as a distributed feedback Bragg (DFB) narrow linewidth laser. Casing this active fiber Bragg grating (FBG) element with the elastic slice to enhance sensitivity the high sensitivity hydrophone sensor is constructed. Afterward, the ability of the detection to hydrophone motion is enhanced by using the both sides symmetrical elastic slices to encapsnlate the disturber of the axile acceleration. And then, the capability of resisthy resting water pressure is promoted via strustural optimization. In a frequency range of 100~1000 Hz the sound-phase sensitivity reached -132.7±0.7 dB (0 dB=1 rad/μPa). The acceleration sensitivity is under -20 dB (0 dB=1 rad/g). The resisting resting water pressure capability is up-to 2 MPa.