The test mass (TM) in space-based gravitational wave detectors acts as an inertial reference but is exposed to high-energy particle radiation, causing charging that interferes with detection. Therefore, charge management for the TM is necessary. This paper presents key advancements in the charge management system for the TianQin project. First, an electrostatic force model is established to determine the TM’s charge threshold, which is limited to less than 2 × 10−13 C. And then, a charge management structure is designed using a UV LED light source, and an engineering prototype is developed based on this design. Furthermore, a ground testing system is constructed with a torsion pendulum to evaluate the performance of charge management. The experimental results demonstrate that the resolution of charge measurement is better than 2 × 10−14 C at 1 mHz, and the resolution of charge control is about 6 × 10−14 C, which probide a solid foundation for TianQin project.