Water saving type toilet capable of mechanically automatic regulating flushing water

This invention discloses a mechanical type water-saving closet that can auto adjust flushing quantity. It includes seat and water intake equipment that in water tank. The intake equipment includes floating ball and intake valve, the ball is connected to intake valve through connecting-rod. The features are that the ball is a floating head of inverse cup form, air holes are set on top part of the floating head, siphunculus that being the second water level station and bottom end is open in floating head inner cave is insert fixed in air holes, the top end of the siphunculus is out of the floating head and is connected to vent valve out of the water tank through air pipe, and bulge that can control the vent valve along with the down press of the cushion is set on the seat. So the air pressure in the floating ball is controlled through the changing of original floating ball, and switching time of vent valve is controlled by the bulge set on the seat to maintain the water level in water tank at high or low position. The whole equipment structure is simple, low cost.