The invention relates to a method for increasing the postweaning oestrus rate of one-birth sows. The method includes the steps that 1, self-help feeding is conducted after weaning, and meanwhile energy substances and nutrient substances are added in feed; 2, feed reducing is conducted 3 days before weaning in a delivery room, the sows cannot be fed on the same day of weaning, and the sows can be raised in a playground or a large pigsty if possible, so that self-help feeding is guaranteed; 3, an ideal feeling temperature is created, and it is guaranteed that the temperature, the humidity and the ventilation quantity are appropriate; 4, a corrected oestrus checking method is executed, an apt measure for spurring the sows into oestrus is taken for the sows which fail to conduct oestrus after weaning is completed for 7 days or do not conduct oestrus for a long time, and the measure should include the three aspects of Chinese herbal medicine estrualization, hormone estrualization and stimulus movement. The postweaning oestrus rate of the sows is increased, the workload of breeders can be reduced, working efficiency is effectively improved, the number of elimination sows is decreased, and cost is lowered; besides, the number of non-productive days of the sows can be decreased, and the year productivity of the sows is improved.