The invention discloses a uniaxial laser gyro north seeker and a north-seeking method thereof. The north seeker comprises a mechanical rotating cabin and an electronic cabin, wherein the mechanical rotating cabin comprises a prism-type digital laser gyroscope, an inclinometer, a rotating cabin secondary power source and a uniaxial rotary table; the electronic cabin comprises a calculation computer, a rotary table controller, an Ethernet converting circuit and an electronic bin secondary power source. The north-seeking method comprises two steps, namely a coarse north seeking step and a fine north seeking step, in the coarse north seeking step, a three-position north seeking method is adopted, and in the fine north seeking step, a two-position north seeking method is adopted. The north seeker provided by the invention can realize functions of high north seeking precision, low power consumption, short north seeking time, high reliability, low cost, and small size under a vehicle-mounted environment, has an anti-interference ability, and can complete north seeking in case of base disturbance caused by blowing, people walking, engine vibration and the like.