The invention discloses a test auxiliary device applied to a test-pit method or single-ring method test. The device comprises a water level balancing component, wherein the water level balancing component comprises a controller and a first water level indicator; the first water level indicator is arranged in a pit or a single ring and is used for detecting the water level in the pit or the singlering in real time; and the controller is electrically connected with the first water level indicator, a setting value is preset in the controller, and the controller is used for comparing a water level value detected by the first water level indicator with the setting value, controlling a water injection unit to stop water injection into the pit or the single ring when the comparison result is that the water level value is equal to the setting value, and controlling the water injection unit to inject water into the pit or the single ring when the comparison result is that the water level valueis smaller than the setting value. Accordingly, the invention further provides test-pit method or single-ring method test equipment. Through the device, the precision of a test-pit method test resultand a single-ring method test result can be improved, and manpower is saved.