Multi-stepping screw type constant-pressure double-dropping funnel

The utility model relates to the technical field of dropping funnels, in particular to a multi-step screw type constant-pressure double dropping funnel, which comprises a tube body and a dropping device, the liquid inlet end of the tube body is connected with a frosted tube, a separator is arranged in the tube body, the dropping device comprises a shell, the bottom of a first liquid storage bin and the bottom of a second liquid storage bin are connected with the shell, and the first liquid storage bin and the second liquid storage bin are connected with the shell. A liquid dropping hole is formed in the shell, one end of the liquid dropping hole is connected with a liquid dropping pipe, one end of the constant-pressure pipe is connected with the liquid dropping pipe end of the shell, the other end of the constant-pressure pipe is connected with the second liquid storage bin, a sliding way is arranged in the shell, a spring and a valve piece connected with one end of the spring are arranged in the sliding way,