Lifting automatic-control-level secondary water recovering and flushing apparatus for toilet

The utility model relates to a device for collecting secondary water used for flushing a toilet for a family, which is additionally provided with a water tank on the basis of an original water closet, wherein, the bottom of the water tank is higher than a water level of the water closet. A water outlet at the bottom of the water tank is connected with a float valve through a pipe. The float valve is arranged in a water tank of the water closet. Water in the water tank which is additionally arranged can automatically flow into the water tank of the water closet. The decrease or the increase of the water level of the water tank of the water closet controls the on-off of the float valve, and the water level of the water tank of the water closet is kept. The position of the water tank can be on the ground surface, which is good for leading water to be poured into the water tank. The water tank can also be raised to the bottom surface of the water tank and is higher than the water surface of the water closet. If a novel water-saving integral water closet is originally arranged in a family, the water tank can also be directly positioned on the water tank of the water closet. The water tank can rise and fall manually or electrically. When the operation is carried out manually, no electric energy is consumed.