The invention discloses an external physical stimulation method for promoting secretion of pearl oysters. The method comprises the following steps: selecting a water tank and storing water in the water tank, wherein the water is pollution-free water, the pH value is 7.5-8.5, the water temperature is 25-28 DEG C, and the dissolved oxygen in the water is sufficient; keeping the depth of the water in the water tank at 20-30 cm, breeding the pearl oysters in the water, and keeping a space between adjacent pearl oysters; putting a pair of electrodes in the water tank, and immersing the electrodes in the water; and implanting pearl nuclei into the pearl oysters, and 40-50 days later, performing recurrent pulse galvanic stimulation, wherein during the galvanic stimulation, the galvanic stimulation is performed through the electrodes at fixed time every day, the time intervals of the galvanic stimulation every day are uniformly distributed within 24 hours, the average current of the electrodes is 0.1-1.5 mA, and the voltage between the two electrodes is 3-12 V. According to the external physical stimulation method for promoting the secretion of the pearl oysters disclosed by the invention, the intensity, frequency and distribution of the stimulation current are reasonably controlled, thus the uniform secretion of the pearl sacs can be promoted, and the effects of shortening the growth period and improving the pearl quality can be improved.