Automatic water level control mechanism

The utility model discloses an automatic water level control mechanism. the control mechanism comprises a main drain pipe (2) arranged at the bottom of the water tank (1); the top end of the main drainage pipe (2) is connected with the bottom end of the longitudinal supporting pipe (3); a telescopic corrugated pipe (4) is arranged in the longitudinal supporting pipe (3); the bottom end of the corrugated pipe (4) is also connected with the top end of the main drain pipe (2); the top of the corrugated pipe (4) is communicated with the inlet end of the movable drainage pipe (5); an opening matched with the movable drainage pipe (5) is formed in the longitudinal supporting pipe (3), a plurality of overflow adjusting pipelines (6) with different heights are arranged above the main drainage pipe(2), sealing plugs (7) are matched with the overflow adjusting pipelines (6), and the overflow adjusting pipelines (6) enable an inner cavity of the water tank (1) to be communicated with the longitudinal supporting pipe (3)