The invention discloses a regulation, storage and purification 
system and method for controlling rainwater and 
sewage confluence overflow 
pollution. A water inlet gallery comprises a 
sewage pump 
station water inlet, a regulation and storage 
sedimentation tank water inlet, a 
water storage type ecological filter tank water inlet and an emergency overflow port which are sequentially increased in height, and the water inlet gallery also comprises a regulation and storage 
sedimentation tank clarification overflow port connected with the 
water storage type ecological filter tank, so that a gradientline for graded treatment according to rainfall is formed, wherein the gradient line comprises a rain-free or small-rainfall line comprising the water inlet gallery, a 
sewage pump 
station and a sewagetreatment 
plant, a medium rainfall line comprising the water inlet gallery, a regulation and storage 
sedimentation tank and a 
sewage treatment plant, a long-time continuous moderate rain line comprising the water inlet gallery, the regulation and storage sedimentation tank, the 
water storage type ecological filter tank and a 
natural water body, a heavy rainfall line comprising the water inlet gallery, the water 
storage type ecological filter and the 
natural water body, and a rainstorm line comprising the water inlet gallery and an emergency overflow port for overflowing water to the 
natural water body; a later line comprises all the lines. According to the 
system, the 
pollution load of discharged water is greatly reduced under the condition of limited regulation and storage volume, and the 
system is economical and efficient.