The invention relates to an efficient polyamide acid fiber cyclizing method. According to the method, silk rolls to be cyclized are placed in a pulsation cyclizing tank, an air inlet valve and a first valve are closed, an exhaust valve is opened, a water circulation vacuum pump is opened for carrying out vacuum pumping, when the vacuum degree in the pulsation cyclizing tank reaches -0.07 to 0.05 MPa, the water circulation vacuum pump stops work, the air inlet valve and the first valve are opened, the exhaust valve is closed, a high-temperature fan is started, air supplemented from a heat exchanger is input into the pulsation cyclizing tank after being heated to 400 to 450 DEG C by a heater, when the temperature in the pulsation cyclizing tank reaches 200 to 300 DEG C, the exhaust valve, the air inlet valve and the first valve are closed, the temperature is maintained for 4 to 6 minutes, and the operation is circulated in such a way until the requirement of cyclizing time being 20 to 30 minutes is met. The efficient polyamide acid fiber cyclizing method overcomes the defects that the heat insulation performance of polyamide acid is good, the heat transfer effect is poor, and the like. The efficient polyamide acid fiber cyclizing method has the advantages that the cyclizing quality is good, the yield is high, the time is short, the energy is saving, and the like; the production efficiency and the production quality of products are improved.