The application provides an elastic needle which is used in cooperation with a base, the elastic needle is assembled in a mounting hole of the base, the elastic needle comprises a needle tube, a plurality of split grooves are formed in the tube wall of the needle tube along the axial direction, the split grooves divide the tube wall of the corresponding area into a plurality of elastic arms which can produce radial elastic deformation, when the needle tube is assembled in the base mounting hole, the tube wall is in elastic contact with the inner wall of the base mounting hole through the radial elastic deformation of the elastic arms. The elastic needle of the application, the needle tube is in elastic contact with the inner wall of the base mounting hole through the elastic arms, so that the
insertion and extraction force of the elastic needle in the mounting hole is increased, and the elastic needle is prevented from being loosened or popped out from the mounting hole in harsh working conditions such as vibration. Meanwhile, the split grooves are designed to make the
tail part of the needle tube have
radial deformation capacity, and prevent the
insertion and extraction force from being too large.