A humidifier includes a base, a water storage tank, an atomizer, and a flow control arrangement. The flow control arrangement includes a water buffering housing, a water control tank a water regulating assembly and a water control device. The water control device includes a floating member movably received in the water control tank, and a water control member extended from the floating member in such a manner that when a volume of water in the water control tank is below a predetermined threshold, the water control member is moved to allow water to flow from the water buffering tank to the water control tank. When a volume of water in the water control tank reaches a predetermined threshold, the floating member is driven by water buoyancy to drive the water control member to stop water from flowing to the water control tank from the water buffering housing.