The utility model discloses an improve cryogenic liquids measurement detection accuracy's device, including vacuum multi -layer insulating box and low temperature liquid storage tank, vacuum multi -layer insulating box is inside be real empty room, and the quilt that is equipped with standard flowmeter is examined in liquid flowing pipeline arranges real empty room in, and this pipeline one end is for accessing to the outer first liquid import of being examined of vacuum multi -layer insulating box, and vacuum multi -layer insulating box is outer is firstly examined the liquid outlet to the other end in order to access to, being full of cryogenic liquids in the low temperature liquid storage tank, being equipped with the quilt of being examined the flowmeter and examining liquid flowing pipeline and arrange incasement cryogenic liquids in, this pipeline one end is examined the liquid import for accessing to the outer second of low temperature liquid storage tank, and the other end is examined the liquid outlet for the second that accesss to low temperature liquid storage tank outer. The utility model discloses a vacuum multi -layer insulating box and low temperature liquid storage tank guarantee standard flowmeter and the unanimity of stabilizing of being examined the environment that the flowmeter is located, has reduced the rate of gasification that low temperature was examined liquid, has reduced measuring error, has improved measurement detection accuracy.