The present invention discloses a water storage and irrigation apparatus, which comprises a water discharging main pipe; a water inlet pipe, wherein the water inlet pipe comprises a first water inlet pipe, a second water inlet pipe, a third water inlet pipe and a fourth water inlet pipe, and the first water inlet pipe, the second water inlet pipe, the third water inlet pipe and the fourth water inlet pipe are sequentially communicated from top to bottom; a filtration screen, wherein the filtration screen comprises a first filtration screen, a second filtration screen and a third filtration screen, one end of the first filtration screen is hinged to the upper end on the upper portion of the first water inlet pipe, the upper surface of the other end of the first filtration screen is magnetically connected to the right side wall of the water discharging main pipe, one ends of the second filtration screen and the third filtration screen are respectively hinged to the left side walls on the lower portions of the second water inlet pipe and the third water inlet pipe, and the upper surfaces of the other ends of the second filtration screen and the third filtration screen are magnetically connected to the right side walls of the second water inlet pipe and the third water inlet pipe; a diversion plate, wherein the diversion plate comprises a first diversion plate, a second diversion plate and a third diversion plate, and the first diversion plate, the second diversion plate and the third diversion plate respectively interfere with the first filtration screen, the second filtration screen and the third filtration screen; and a water storage box. The water storage and irrigation apparatus of the present invention has advantages of simple structure, smooth use, no clogging of the filtration screen, water saving, energy saving, and the like.