The invention discloses a novel output parameter detection device for the direct-current system charge device of a transformer substation. The novel output parameter detection device comprises a voltage adjustment device (1) for detection, a discharge load device (2) for detection, and a detection host (3), and is characterized by further comprising a detection auxiliary device (7), wherein the detection auxiliary device (7) comprises an alternating-current voltmeter (7-1), a direct-current voltmeter (7-2), the input interface and the output interface of at least one charge device, an alternating-current input switch (7-8) and a direct-current output switch (7-9); the direct-current output switch (7-9) is connected with the discharge load device (2) for detection, and the detection host (3). The novel output parameter detection device disclosed by the invention is capable of ensuring the personal safety of working personal and the running safety of transformer substation equipment, efficiently finishing detection for the stable voltage output by a charge module, a ripple wave and a steady-current precision, of each direct-current system of the transformer substation, judging charge devices which do not meet the running requirements, and replace the charge devices in time, so as to ensure the safety running of the direct-current system.