A Low price Cryogenic liquid pump, used for transporting cryogenic liquid, includes a motor and a pump body, the pump body includes a pump housing, a drive shaft arranged in the pump housing and connected to the output end of the motor, connected to The impeller at one end of the transmission shaft facing away from the motor and a cold shrink part sleeved around the transmission shaft; a radial gap is provided between the cold shrink part and the transmission shaft, and when the low temperature liquid volatilizes, a flow When the low-temperature gas passing through the radial gap, the amount of cold shrinkage of the cold shrinkage part is greater than the cold shrinkage amount of the drive shaft. The Low price Cryogenic liquid pump provided by the present invention is provided with a cold shrinkage part sleeved on the drive shaft When the cryogenic liquid evaporates, the generated cryogenic gas leaks to one end of the motor through the radial gap existing around the drive shaft, the cold shrinkage part will produce cold shrinkage to reduce the radial gap, thereby reducing the circulation space of low temperature gas, and reducing The leakage of low-temperature gas reduces cold leakage.

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