The invention discloses a coaxial multi-stage float valve element. The coaxial multi-stage float valve element comprises multiple stages of valve element assemblies which become big and are connected in sequence; each stage of valve element assembly comprises a valve cover and a valve element movably connected with the valve cover; a circulating valve hole is formed in the bottom of each valve cover; except for the valve element of the first stage of valve element assembly, the upper end of the valve element of each of the remaining valve element assemblies is fixed to the bottom of the valve cover of the last stage of valve element assembly, a flowing channel is formed in each of the remaining stages of valve element assemblies and communicated with the circulating valve hole in the last stage of valve cover, and a plug is arranged at the lower end of each of the valve elements and adapts to the circulating valve hole in the corresponding stage of valve cover. By the adoption of the coaxial multi-stage float valve element, the flow of discharged liquid can be effectively controlled.