Elastic sheet

The utility model discloses an elastic sheet, which comprises a bottom plate, side walls and an elastic arm, the side walls are arranged on two opposite sides of the bottom plate, windowing structures are arranged on the side walls, the elastic arm comprises a first elastic force arm, a contact part, a second elastic force arm and a limiting part which are sequentially connected, the first elastic force arm is connected with the bottom plate and located between the two side walls, and the second elastic force arm is connected with the bottom plate and located between the two side walls. The contact part is located at the top end of the first elastic force arm and is bent downwards from the contact part to form a second elastic force arm, and the end part of the second elastic force arm is bent to form a limiting part; wherein the top end of the window opening structure is provided with an anti-falling structure which is bent inwards towards the second elastic force arm, and the limiting part transversely pene