The invention discloses a mobile laboratory for heavy current transformer field error calibration. The mobile laboratory comprises an integrated current transformer field calibration device, an integrated operating system, a test environment monitoring system and a safety monitoring system, wherein the integrated current transformer field calibration device and the integrated operating system are arranged in the mobile laboratory. The mobile laboratory is advantaged in that problems of high labor intensity, and low work efficiency and low safety level caused by complex equipment operation existing in a heavy current transformer field error calibration process are solved, the high equipment integration level and high work efficiency are realized, getting off for operation, field hoisting and temporary test system building during heavy current transformer field error calibration are not required, operation is simple and convenient, heavy current transformer field error calibration is guaranteed to be safe and be in order, the error calibration result has good repeatability and high accuracy, and national magnitude transmission accuracy and reliability are guaranteed.