The invention relates to a heat management device of an automobile engine and a heat management control method of the heat management device. The heat management device of the automobile engine comprises a heat management device body. A water pump and generator mounting supports are arranged on a heat management device shell. An electronic thermostat is arranged in the heat management device shell, an electronic thermostat cover plate is arranged outside the electronic thermostat, and the electronic thermostat cover plate is connected with the heat management device shell. According to the heat management control method, the steps that the strategies of cylinder water input and cylinder water output are achieved, high-temperature cooling water passing through a cylinder and a cylinder cover can pass through a cylinder water jacket again, a combustion chamber is kept at a relatively high temperature level, better combustion is achieved, combustion efficiency is improved, and emission is reduced. Layout space is saved, efficient heat management is achieved, and cost is reduced.