The invention discloses a direct-current current transformer field checking device and method based on a standard source. The device comprises a standard direct-current current source, a standard direct-current current comparator, a control room transformer digital checker, a control room local monitor module, a control room GPRS (general packet radio service) module, a 24-bit AD (analog/digital) acquisition unit, a current field transformer digital checker, a current field GPRS module and a transformer calibration platform, and the standard direct-current current source, a primary side of a direct-current current transformer under test and the standard direct-current current comparator are connected and form a loop; the primary side passes through the standard direct-current current comparator and is connected respectively with the 24-bit AD acquisition unit and the current field transformer digital checker and then connected with the transformer calibration platform; a secondary side is connected sequentially with the control room transformer digital checker, the control room local monitor module and the transformer calibration platform; the transformer calibration platform is connected with the standard direct-current current source through optical fiber or a cable. Mutual feedback between the standard source and a power source is implemented herein, and output precision of a current source is under strict control.