Firstly, this article introduces the composition, instrument layout, and hardware connection of the low-temperature superconducting full tensor magnetic gradient measurement system. Then, the test results of each module in the system development process are analyzed, including the noise test and SQUID sensitivity test of the measurement and control system. Secondly, the ground static and dynamic experiments of the system are described in detail. The dynamic range, measurement accuracy, and stability of the system are tested. Each component of the magnetic gradient measurement accuracy of the system static experiment is better than ±30 pT/ m. Finally, the flight test is implemented in Danyang, Jiangsu Province. According to the DZ/ T 0142—2010 Technical Specifications for Aeromagnetic Survey, the measurement results show that the coincidence accuracy in the repeated lines of each tensor component is better than ±25 pT/ m, and the average dynamic measurement sensitivity of each measuring line is better than ±30 pT/ m. This system has reached the level of engineering prototype, greatly improving the practicality of the low-temperature superconducting full tensor measurement system. It provides a solid foundation for future research work in the field of low-temperature superconducting navigation magnetic measurement in China.