The spring touch finger is a ring spring, which can transmit strong current in small space, and can also be used for purely mechanical connection. It is suitable for use in a variety of static or dynamic medium and high pressure environments. It can be used in robot industry, automobile industry, space industry, petrochemical industry, medical industry, submarine industry and so on. This new type of spring has unique load - deformation curve, wide working area and high permitted compression of springs. It can maintain a nearly constant elastic force in the larger deformation range. The winding coil is elliptical and tilted. When compressed, each coil will be deformed individually. No matter which part of the coil is deformed, the whole spring will react to achieve the same load at each point.