The utility model discloses an intravaginal sponge plug for livestock, which comprises a soft absorbent capable of absorbing inhibitors. The intravaginal sponge plug is characterized in that the soft absorbent is provided with a pull line. The intravaginal sponge plug can regulate operation and guarantee sanitation, has stable form after being set, particularly is easy for operation and difficult to be lost when being taken out, and then is extremely adaptable to controlling oestrous periods of livestock such as sheep, goats, deer, cows, horses and the like. Skillful technicians can complete operation of one body within one minute.