The utility model discloses a two coupling air spring rigidity adjusting device, including bent bag frame, an air spring who sets up tandem arrangement in bent bag frame and the 2nd air spring, the middle cross beam of setting in the middle of two air spring to and fill gassing mechanism and power input mechanism, inflate or exhaust an air spring and the 2nd air spring, the next rigidity that changes two coupling air spring through filling gassing mechanism. Through the monitoring of baroceptor to air spring inside atmospheric pressure, control is filled gassing mechanism and is filled the gassing to air spring, adjusts the inside gas pressure of an air spring and the 2nd air spring to realize the adjustment of two air spring rigidity, the device compact structure, convenient to use when external environment condition and the change of power excitation source, need not to change the regulation that two coupling mechanism spring rate can be realized to the spring, have enlarged two coupling spring mechanism's application range, have improved adaptability.