The invention relates to a clamp for clamping a feeler lever to continuously penetrate and pull out feeler lever. The clamp comprises a harness, a harness fixing piece and two chucks fixed in the harness through the harness fixing piece. The clamp is characterized in that each chuck comprises a small metal block (3) and a large metal block (9), wherein a notch for containing a compression spring (8) is formed in the inner side of each small metal block (3); a metal contact head (2) is fixed to the outer end of each compression spring (8); a friction plate (1) for increasing friction between the small metal block (3) and the feeler lever is further arranged on the inner side of each small metal block (3); triangular protrusions (5) are arranged on the two sides of each small metal block (3); each small metal block (3) is surrounded by the corresponding large metal block (9); each large metal block is matched with the protrusions (5) of the corresponding small metal block (3) through grooves (7) formed in the large metal block, and therefore that the moving track of the small metal blocks (3) can only move up and down can be determined. The clamp has the advantages of being reliablein clamping and capable of achieving automatic continuous operation.