An intelligent air-entrapping anti-theft system for an LNG dispenser includes a box body, wherein a liquid return port and an LNG dispenser gun are arranged on the box body; a gas-liquid separator, a mass flowmeter, a computer measuring and controlling device, a radio frequency chip and a receiving module are arranged inside the box body; the radio frequency chip is mounted at the front end of the LNG dispenser gun; the receiving module is mounted at the liquid return port of the LNG dispenser; one end of the LNG dispenser gun can be connected with the liquid return port of the LNG dispenser, and the other end of the LNG dispenser gun is connected with a box body liquid supply port through an LNG hose; an air-entrapping button and a precooling button are arranged on the box body. According to the utility model, the intelligent air-entrapping anti-theft system for the LNG dispenser is built between the liquid return port and the LNGdispenser gun, can be used for detecting whether the LNG dispenser gun is placed at the liquid return port or not, avoids misoperation caused by deliberate gas stealing or mistaken pressing of the air-entrapping button and the precooling button to further avoid financial chaos and economic loss caused by gas stealing and misoperation, and is simple in structure and convenient to operate.