The invention discloses an optical fiber accelerometer. The accelerometer comprises a light source, a coupler, a connector, a liquid and an optical detector; the connector is composed of N tubes withthe connected bottoms, and is injected with the liquid; the liquid is located at the bottoms of the N tubes, and the liquid surface of the liquid in the tubes is in an arc shape; a first port of the coupler is connected with the light source through a first tail fiber, and a second port of the coupler is connected with the optical detector through a second tail fiber; a third port of the coupler is connected into the first tube through a third tail fiber, a fourth port of the coupler is connected into the second tube through a fourth tail fiber, ..., an (N+2)th port of the coupler is connectedinto the Nth tube through an (N+2)th tail fiber, wherein N is greater than or equal to 2 and is an integer; the distances between the end parts of the third tail fiber, the fourth tail fiber, ..., and the (N+2)th tail fiber, and the liquid surface in the tubes are h1, h2, ..., and hN respectively, and the distances are all positive numbers; and the top of each tube is sealed and filled with gas.The accelerometer has the beneficial effects that the measurement error is reduced, the sensitivity is improved, and the anti-electromagnetic interference performance is improved.