On July 12, 2023, the first central solenoid (CS) coil for the HH70 high-temperature superconducting tokamak device was successfully developed. The CS coil has an outer diameter of approximately 60 centimeters and is processed through insulation, winding, impregnation, and other steps using high-temperature superconducting tapes. The central solenoid of HH70 consists of 8 CS coils and, together with 6 poloidal field (PF) magnets, will provide the poloidal magnetic field for the device. The main function of the central solenoid is to provide ohmic heating during the plasma generation and current ramp-up phase and to participate in controlling the plasma shape during the plasma operation process.