An engine start and stop control system in the technical field of automobile electronic control comprises an intelligent sensory control system, an engine management system, an energy storage power source, an electric generator, a starting motor, a vehicle-mounted electric appliance and a current sensor of the vehicle-mounted electric appliance. Through receiving and processing voltage signals, temperature signals and current signals of the energy storage power source, the intelligent sensory control system accurately estimates state parameters, including dump energy, starting minimum voltage and a battery life state, of a current energy storage system, current related information from the engine management system and the vehicle-mounted electric appliance are synthesized, and energy optimization and service life optimization intelligent algorithms are adopted for dynamically adjusting operation condition points of the engine and for controlling start and stop of the engine. The engine start and stop control system is reasonable in design and suitable for whole vehicle electric energy management and the engine start and stop control, service life of the vehicle-mounted energy storage unit is further prolonged, energy consumption of the engine is reduced, and emission is reduced.