The invention discloses a liquefied natural gas gas-cylinder integration valve and a control method thereof. The valve is provided with a body, and a liquid filling internal inlet, a gas using inlet, a liquid using inlet, a liquid using stop valve port, an economic air throttle port, a liquidometer port, a gas return stop valve port, a safety valve port, an excess flow valve port, a liquid filling external inlet and a gas return port are formed in the body; a gas using channel is formed by communicating the gas using inlet, the economic air throttle port, the liquid using stop valve port and the excess flow valve port; a liquid using channel is formed by communicating the liquid using inlet, the liquid using stop valve port and the excess flow valve port; a gas return channel is formed by communicating the gas using inlet, the gas return stop valve port and the gas return port; a liquid filling channel is formed by communicating the liquid filling external inlet and the liquid filling internal inlet; and a pressure measuring channel is formed by communicating the gas using inlet and the safety valve port. The liquefied natural gas gas-cylinder integration valve is compact in structure, more reliable in safety and meanwhile lower in cost.