The invention mainly relates to a natural gas recovery system and method with an adsorption method. The system mainly comprises a fan, heat exchangers, a buffer tank, a vacuum pump, a natural gas compressor, an ANG cylinder and the like. The combined type natural gas recovery system which is safe, efficient, economical and high in automation degree is provided for the disadvantages of safety and economical efficiency of compressed natural gas and liquefied natural gas, and the system can be in a vehicle-mounted type and is convenient to move and operate. Natural gas is charged in the buffer tank, and then the natural gas in the buffer tank is compressed at medium pressure to be stored in the absorption type gas cylinder; when outside pressure is lower than the pressure of the gas cylinder, the gas is desorbed to be supplied to the outside and can be used as energy; and the absorption type gas cylinder can be demounted and replaced, and continuous operation of the whole system is not influenced. The factors of residual cold recovery, oxygen content monitor and the like are fully considered.