The invention relates to an intelligent integrated controller of a generator set and a control method of the intelligent integrated controller. The intelligent integrated controller of the generator set comprises an MCU, an I / O control circuit, a communication unit, a human-machine interaction unit, a storage unit and a power source unit. The I / O control circuit is connected to a sensor detection unit, an executing unit and a 32-bit I / O port capable of being redefined. The sensor detection unit comprises an oil pressure sensor, a diesel oil level sensor, a cooling water temperature sensor, an engine starter rotation speed sensor, a diesel engine rotation speed sensor, a three-channel current sensor, a three-channel mains voltage sensor, a three-channel generator voltage sensor and a generator rotation speed sensor. The executing unit comprises a generator voltage automatic adjustment executor, an engine starter, an emergency stop button, a fuel injection pump executor, a cooling liquid high water temperature switch, a low oil pressure switch, an external locking switch and a breaker closing and opening controller. By the adoption of the intelligent integrated controller of the generator set and the control method of the intelligent integrated controller, the labor cost can be reduced, and the reliability of products is greatly improved.