The utility model discloses a control device and system for grate and feeding device of incinerator. The device includes a collecting device, a DCS(Distributed Control System) control unit and an analog quantity output module, wherein the DCS control unit is connected with the collecting device which is used for collecting and processing the operating status data of the grate and the feeding device to generate operating status data flow through utilizing the analog quantity output module and on-off input module, the DCS control unit is used for receiving and processing the operating status data flow input by the field bus, the analog quantity output module is arranged correspondingly to the controlled devices of the grate and the feeding device and used for inputting the analog quantity processing results which are used for controlling the operating parameters of the controlled devices of the grate and the feeding device. The control device and system for grate and feeding device of incinerator overcomes the defects of high difficulty in overhauling communication faults.