The invention discloses a self-triggering partition device of a concrete pouring pile head. The self-triggering partition device of the concrete pouring pile head comprises an air bag and an inflationdevice, wherein the air bag is arranged on vertically arrayed annular reinforcing steel bars at the partition position of the pile head of a prefabricated reinforcing cage, and the inflation device inflates the inside of the air bag; the device is characterized in that the air bag comprises an outer layer air bag and an inner layer air bag which are arranged in a clearance manner; the inflation device comprises a plurality of self-triggering inflation devices acting with the inner layer air bag and the outer layer air bag at the same time; the device comprises a gas generator and a trigger device thereof, the gas generator comprises a high-pressure air bag and a three-way ball valve, three valve ports of the three-way ball valve communicate with an air outlet of the high-pressure air bag,the inner layer air bag and the outer layer air bag, and the trigger device is a floating pull rod mechanism which is driven by buoyancy of super-filled concrete to drive a valve core switch of the three-way ball valve to rotate; and the device further comprises a clamping mechanism for fixing at least one of the inner layer air bag and the outer layer air bag to the annular reinforcing steel bars. According to the device, the air bag can be automatically triggered to be inflated to partition the pile head when the concrete is over-poured, the execution is rapid, the operation efficiency is high, the structure is simple, and the manufacture is easy.