The invention provides a plate spring. The plate spring comprises at least two spring arms and an inner fixing hole, wherein the at least two spring arms and the inner fixing hole are centrally and uniformly distributed; the structure of each spring arm is the same; the outermost end of each spring arm is provided with an outer fixing hole. The invention also provides the plate spring assembly and the compressor. The plate spring assembly comprises a plurality of plate springs. The compressor comprises the plate spring assembly. According to the plate spring, the structure of multiple concentric circular arms and a concentric spiral arm is adopted; the plate spring has smaller equivalent mass, and the situation that parts are increased to meet the requirements on rigidity and natural frequency is avoided, so that the product quality is reduced and the cost is reduced.