An elastic hinge for spectacles includes a first hinge component having two chip elements connected together by means of being partially overlapped, and a second hinge component having two chip elements superimposed together. One chip element in the first hinge component is connected with the chip element of the second hinge component. A gap is disposed at the joint of one chip element of the first hinge component and one chip element of the second hinge component. Movable space is formed between the first hinge component and the second hinge component, so that the hinge elastically moves inwards or outwards. The elastic hinge is installed after the trim and the arm of the spectacles. Relying on the mutually smart cooperation of the components, the arm of the spectacles can have functions of bounding inwards and outwards without the help of any slingshot element, and has good durability.