The invention discloses a hindered amine antioxidant and a polyethylene material, wherein the hindered amine antioxidant comprises the following structure (I) defined in the specification, R1 is alkyl, R2 and R3 are selected from hydrogen or the following general formula (II), at least one of R2 and R3 is selected from the following general formula (II) defined in the specification, R4 is chain-like hydrocarbonyl, and R5, R6, R7, R8, R9, R10, R11, R12, R13, R14 and R15 are independently selected from hydrogen or alkyl. According to the present invention, the hindered amine antioxidant has advantages of good compatibility with polymers, good anti-migration performance and good anti-solvent-extraction performance, can be used for the anti-aging of a variety of polymer materials, has the light color, and is not easily colored.