The invention discloses a steam generator simulation body water supply system used in the heating and boosting process and a control method. The water supply system comprises a steam generator simulation body, a water supply voltage stabilizer and a condenser. The water supply voltage stabilizer communicates with the steam generator simulation body through a water inlet pipe. The steam generator simulation body communicates with the condenser through a steam pipe. A water feed pump is arranged on the water inlet pipe. The outlet end of the condenser communicates with the inlet end of the waterfeed pump through a cold water pipe. A frequency conversion multi-stage centrifugal pump is adopted as the water feed pump. A bypass branch pipe of the water feed pump is arranged on the water inletpipe in parallel. A heat regenerator is arranged on the water inlet pipe and located at the rear end of the water feed pump. The outlet end of the heat regenerator communicates with the inlet end of the condenser. The inlet end of the heat regenerator communicates with the outlet end of the condenser. Flow meters and regulating valves are arranged on the water inlet pipe, the steam pipe and the bypass branch pipe correspondingly.