NOVELTY - A control system for methane fermentation process, comprises in turn through a pipeline connected with raw material adjusting tank (1), feeding device (2), methane fermentation tank (3), biogas outlet, methane outlet (31) and discharging port (32), tank is set on upper line pH meter (4) and liquid sampling device (6), online pH gauge is electrically connecting A/D converter (5) and main controller (11), device is connected with filter (7), filter is connected with depth filter (8) and online chromatography (9), and controller connecting programmable logic controller (PLC controller).    USE - As control system for methane fermentation process (claimed).    ADVANTAGE - The system has high rate of gas production capacity of pool, but also avoids severe acidification of methane fermentation system.    DETAILED DESCRIPTION - A control system for methane fermentation process, comprises in turn through a pipeline connected with the raw material adjusting tank (1), a feeding device (2), a methane fermentation tank (3), a biogas outlet is set up the marsh gas fermentation tank, methane outlet (31) and a discharging port (32), a methane fermenting tank is set on the upper line pH meter (4) and liquid sampling device (6), an online pH gauge (4) is electrically connecting an A/D converter (5) and a main controller (11), liquid-sampling device (6) is connected with the filter (7), filter is connected with the depth filter (8) and online chromatography (9), filter is connected with the on-line titrator (10), chromatography (9) and on-line titrator (10) electrically connecting the main controller (11), a main controller (11) connecting the PLC controller (12), PLC controller connecting the feeding device (2), main controller is installed with a marsh gas ferment process control software feeding device, and methane outlet and discharging ports are respectively connected with the marsh gas fermentation tank provided with a valve (13), (14), (15). An INDEPENDENT CLAIM is included for methane permentation process using control system involving 1) periodically measuring volatile solids (VS) concentration in the raw material in raw material adjusting tank; 2) by the main controller and opening the opening mounted on the marsh gas fermenting process main controller in the control software, setting initial values related parameter, such as volatile solids (VS) concentration, reactor effective volume of raw material, gradually increased organic load rate of program parameter, a feeding organic load rate, marsh gas ferment process control software largest feeding quantity according to the volatile solids (VS) concentration of preset raw material, reactor effective volume and feed organic load ratio set time, the main controller by the PLC controller controls the feeding amount of feeding device; 3) by opening the liquid-sampling device, on-line chromatography, on-line titrator and on-line pH meter, the liquid sampling device collecting liquid sample and filtering are transmitted to the online chromatography; the titrator, in order to ensure the online chromatographic particulate matter impurity of sample, the filter entering the online chromatographic sample and the depth filter again taking depth-type filtration and chromatography, the titrator, online pH gauge, the liquid sample taking every 24 hours analysis, and the volatile fatty acid concentration, alkalinity, alkalinity, alkalinity volatile fatty acid such as data transmission to the main controller, online pH gauge by an A/D converter converts the information data signal transmitted to the main controller, online pH gauge is set on the marsh gas fermentation process main controller to control software in one data input taking, processing to form data, at the same time, analyzing and judging range of the two data value, and according to the pre-set program by the main controller software sends an instruction, via the PLC controller and feeding device for feeding.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the control system for methane fermentation process.    Raw material adjusting tank (1)    Feeding device (2)    Methane fermentation tank (3)    Online pH gauge (4)    A/D converter (5)    Liquid-sampling device (6)    Filter (7)    Depth filter (8)    Chromatography (9)    On-line titrator (10)    Main controller (11)    Programmable logic controller (PLC controller); (12)    Valve (13, 14, 15)