The invention provides a method for improving the yield of fresh portulaca oleracea at Jiangsu coastal beaches. According to the invention, portulaca oleracea is planted at coastal beach sandy loam plots, wherein a sowing amount is 450g/667m<2> and a planting row space is 50cm; when portulaca oleracea growth period reaches approximately 45 days and 6 leaves appear at each plant, a plant growth regulator containing gibberellin (15-30mg/L) is sprayed; spraying is carried out with intervals of 5-6 days, and an appropriate amount of 20ml is sprayed at each plant; and when the plants are mature, the fresh vegetables are picked in 3-5 times. The implementation is simple; and the investment is low while the gain is high. With the method, an average increase in fresh portulaca oleracea yield is higher than 30%.