Split type variable water level control device

The invention provides a split type variable water level control device, which comprises a water storage tank, a water level balancing cylinder and a water passing pipe, wherein a water retention diaphragm is arranged in the water storage tank, the water storage tank is segmented into a water supplementing side and a water outlet side, and a water passing hole is arranged in the lower part of thewater retention diaphragm; the water level balancing cylinder is arranged below the water storage tank, and the height of the water level balancing cylinder can be adjusted at will; one end of the water passing pipe penetrates through the side wall of the water outlet side to enter the water storage tank, a pipe opening of a second water passing pipe at the other end of the water passing pipe is connected with a water inlet of the water level balancing cylinder, and the highest position of the water passing pipe is lower than the highest position of the water level in the water storage tank; and the water flow passing