The invention discloses an analog digital combined control module based on energy statistics and an automatic gain control method. The analog digital combined control module comprises an analog gain control unit and a digital signal processing unit, wherein the analog gain control unit is connected to a first filter, an ADC conversion unit, a digital energy statistics unit and the digital signal processing unit in sequence; the analog gain control unit receives a signal from an input interface through a second filter and transmits the signal to the ADC conversion unit after filtering; the digital signal processing unit receives an analog signal from the ADC conversion unit, carries out statistics on the energy of the analog signal and arranges reference signal strength to the digital signal processing unit; and an output end and an output interface of the digital signal processing unit are connected to a feedback control end of the analog gain control unit. The analog digital combined control module has the advantages of easiness in debugging, high precision, high sensitivity and high dynamic range and can be used for meeting the requirements for simplicity, high efficiency and low cost of an onboard receiving machine in a seaborne intermediate frequency digital broadcasting system.