This article proposes and designs an improved magnetic hyperthermia device to address the problem of large switch losses, the feedback system hysteresis and poor control effect, and also the uneven magnetic field leading to poor treatment effect in traditional tumor magnetic hyperthermia device. Firstly, it addresses the issues of high switching losses and limited driving capabilities by using totem pole drive circuits in terms of circuit design. In addition, the proposed control system achieves the power control by the fiber optic temperature sensor combined with an adaptive fuzzy control PID algorithm, which improves the response speed without interference from magnetic field. The proposed strategy also overcomes the feedback lag and large overshoot in nonlinear and time-varying systems for traditional PID control by identifying the dynamic characteristics of the system in real time and dynamically adjusting control parameters. Finally, this article also conducts further research on the problem of uneven magnetic fields based on finite element modeling method, which is improved by designing the auxiliary coils both sides of main solenoid coil and adjusting the size and number of main coil turns. The experimental results show that the proposed magnetic hyperthermia device exhibits significantly enhanced driving capability and closed-loop feedback stability compared to the prototype device. The relative deviation of magnetic field uniformity (δB) is reduced from 5.1% to 1.3% over an operating frequency range of 120~300 kHz. In addition, the steady-state temperature fluctuation within the edge area has increased by approximately 2℃ compared to the original case. Furthermore, this proposed system achieves more efficient magnetocaloric conversion in the improved solenoid coil magnetic field compared to existing devices in the literature after combining the driving circuit with the adaptive fuzzy control PID algorithm. This faster and more stable heating performance provides a more efficient hardware solution for the clinical application of magnetic therapy device.