Bi-directional self-circulation liquid indicator detection device

The invention discloses a bi-directional self-circulation liquid indicator detection device, which comprises a main tank and a branch tank. Emptying pipes with valves are connected with water outlets of the main tank and the branch tank respectively, the interior of the main tank is communicated with the interior of the branch tank through a pipeline controlling component, and by means of the pipeline controlling component, detecting liquid in the main tank can be transported into the branch tank or detecting liquid in the branch tank can be transported into the main tank. A mounting rack on which top-mounted liquid indicators are installed is arranged on the top of the main tank, and a position adjusting mechanism used for adjusting the vertical position of the mounting rack is arranged between the mounting rack and the main tank. A transparent glass tube and a mounting tube with a valve which are communicated with the interior of the main tank are vertically arranged at the outer side of the main tank, a sc