Low-temperature medium density sensor calibration method

The invention relates to a low-temperature medium density sensor calibration method, which comprises the following steps of: 1, selecting experimental reference low-temperature liquid media A0 and A2 according to a medium A1 to be measured, an upper limit temperature Tmax in use and a lower limit temperature Tmin; 2, measuring the capacitance C0 of the sensor immersed in the A0 under approximate standard atmospheric pressure, and knowing the relative dielectric constant epsilon A0 of the A0 under the condition; step 3, under approximate standard atmospheric pressure, measuring the capacitance C2 of the sensor immersed in the A2, and knowing the relative dielectric constant epsilon A2 of the A2 under the condition; 4, substituting C0 and C2 into a formula C = K * epsilon + Cs, and solving to obtain sensor structure coefficients K and Cs; step 5, measuring the capacitance C1 of the sensor immersed in the A1 under approximate standard atmospheric pressure, and knowing the relative dielectric constant epsilon A1