This needle has a positioning line that is made of flexible material and pushed into the chest cavity when the positioning is completed. As such, the pulling force of the thread body on the anchoring needle is effectively avoided, minimizing the displacement of the anchoring needle. Four hooks on the needle help further stabilize the positioning. The positioning line is made with various color segments, which makes intuitively determining the depth of nodule easy. It is used to mark and indicate the depth in the procedure of wedge excision of lung.