The invention provides a high-potential electronic board for high-altitude areas and a control method thereof. The high-potential electronic board comprises a logic circuit, and a power monitoring circuit, a voltage detection circuit, a light receiving circuit, a light emitting circuit and a trigger circuit which are connected with the logic circuit, and a backup trigger circuit which is connectedin parallel with the trigger circuit. The trigger circuit of a high-altitude TE board is simplified. The high-potential electronic board is safe and reliable, and is suitable for use in harsh environments at high altitude.