The invention discloses an energy-saving heating system of a laminating machine. The energy-saving heating system is used for regulating the temperature inside the laminating machine. The energy-saving heating system of the laminating machine comprises a temperature detecting device, a PLC, a frequency converter, a circulating pump, an oil cylinder, a heating system and a temperature control unit;the temperature detecting device, the PLC, the frequency converter and the circulating pump are sequentially connected; the oil cylinder is connected with the laminating machine by the temperature control unit and the circulating pump; and the circulating pump is used for conveying heat transfer oil in the oil cylinder into the laminating machine. When the energy-saving heating system works, thetemperature inside the laminating machine is detected by the temperature detecting device, the PLC and the frequency converter control the circulating pump and a proportional valve to work according to a detection result of the temperature detecting device, furthermore, the working frequency of the circulating pump is regulated according to actual demands, energy source loss caused by the condition that the circulating pump is in a high-frequency operating state in the whole process is effectively avoided, and therefore, the aim of saving energy sources is achieved.