This research addresses the critical need for optimized magnet power supplies compatible with High-Temperature Superconducting (HTS) magnets in fusion energy. HTS magnets are essential for generating the powerful, stable, and precise magnetic fields required in magnetic confinement fusion devices. The magnet power supply (MPS) is a critical enabling system, managing electrical energy and providing precise current regulation for these magnets. Crucially, the MPS must be specifically engineered to accommodate HTS properties and meet fusion’s stringent operational constraints. A power supply system topology incorporating full-bridge rectifier units and H-bridge modules in parallel was designed, followed by simulation validation of its output characteristics with the HTS requirements. The power supply provides ±120 V / 30 kA DC, allowing for four-quadrant operation with a current regulation precision of 0.1%. Simulations validate crucial performance metrics: power control response time of 0.3 ms, complete current reversal (±30 kA) in 51.64 ms, and initiation of quench protection within 8.77 ms. The study advances critical magnet power supply technologies, encompassing topology reconstruction, adaptive control strategies, and safety interlocks, which are essential for enhancing the operational stability and economy of future commercial fusion reactors employing HTS magnets.