The invention discloses a plate spring, an elastic support provided with the plate spring, and a compressor provided with the elastic support and relates to the technical field of air conditioners. By the adoption of the plate spring, the elastic support and the compressor, the technical problem that in the prior art, axial elastic supporting and a good radial supporting effect of a piston cannot be guaranteed simultaneously is solved. The plate spring comprises a first elastic arm and a second elastic arm. The distance between the inner edge of the first elastic arm and the outer edge of the inner end of the second elastic arm or between the inner edge of the first elastic arm and the outer edge of at least part of the inner end of the second elastic arm is larger than the distance between the inner edge of the first elastic arm and the outer edge of the other part, except the inner end, of the second elastic arm. The distance between the inner edge of the second elastic arm and the outer edge of the inner end of the first elastic arm or between the inner edge of the second elastic arm and the outer edge of at least part of the inner end of the first elastic arm is larger than the distance between the inner edge of the second elastic arm and the outer edge of the other part, except the inner end, of the first elastic arm. Both the elastic support and the compressor comprise the plate spring. The plate spring, the elastic support and the compressor are used for simultaneously guaranteeing axial elastic supporting and the good radial supporting effect of the piston.