The invention discloses a symmetrical structure accelerometer north seeker and a dynamic difference north-seeking method. The north seeker comprises a servo motor, a photoelectric encoder, a rotary table, two accelerators and a conducting ring, wherein the rotary table is of a connecting rod type symmetrical structure, the two accelerators are symmetrically arranged and mounted on the rotary table, a certain offset distance exists between the two accelerators and the axis of the rotary table, the output shaft of the servo motor is fixedly connected with the rotary table, the rotary table can rotate at a constant speed under the driving of the servo motor, and the absolute acceleration of a reference point is measured by the accelerometer for azimuth angle resolving. The inertial centrifugal force generated when the accelerometer is eccentrically configured can be eliminated, and the difficulty of speed stabilizing control for the rotary table is reduced. Moreover, according to the dynamic difference north-seeking method, the influences on latitude parameter, accelerometer zero offset and positioning dimension error are eliminated through difference and proportion calculation, and the azimuth angle resolving precision can be effectively improved.