The utility model provides a high-reliability fiber bragg grating acceleration sensor with an automatic temperature compensation function and belongs to the optical fiber sensing technical field. With the high-reliability fiber bragg grating acceleration sensor adopted, the problems of low sensitivity and poor reliability of a traditional fiber bragg grating sensor can be solved. The high-reliability fiber bragg grating acceleration sensor includes a diamond-shaped beam, a vibration beam, a mass block and fiber bragg grating; the diamond-shaped beam includes a diamond-shaped cylinder and four square-shaped beams; the cross section of the diamond-shaped cylinder is diamond-shaped; the four square-shaped beams are arranged at external-side walls corresponding to four angles of the diamond-shaped cylinder and are located at the same plane; the upper surfaces of two square-shaped beams at external-side walls corresponding to two acute angles of the diamond-shaped cylinder are provided with U-shaped grooves; the vibration beam includes a sensitivity-enhancing groove, a vibration arm and a fixing seat; the fixing seat is fixedly connected with the vibration arm through the sensitivity-enhancing groove so as to form one entity; a tail end of the vibration arm is clamped in a groove of the upper surface of the mass block; tail ends of the two square-shaped beams at external-side walls corresponding to two obtuse angles of the diamond-shaped cylinder are fixed on the sensitivity-enhancing groove of the vibration beam; the fiber bragg grating is embedded in the grooves of the diamond-shaped beam and extends out from the grooves. The high-reliability fiber bragg grating acceleration sensor is applicable to the optical fiber sensing technical field.