The invention discloses a property detecting device of ultra-polarization inert gas NMR system in the detecting technique domain, which comprises the following parts: sealing container, layer thickness measuring part, image geometrical distortion measuring part, resolution factor measuring part and vacuum valve, wherein four layer thickness measuring parts are adhered on four internal lateral walls of sealing container; two image geometrical distortion measuring parts are adhered on two mutual vertical surfaces of two layer thickness measuring parts; the resolution factor measuring part is set in the middle of sealing container for inert gas; two vacuum valves are set on two laterals of sealing container. The invention can measure the signal-to-noise ratio, layer thickness, position and image geometrical distortion and image resolution parameter in the ultra-polarization inert gas NMR system. |