Novel safety joint

The utility model relates to a borehole operation tools of petroleum industry, in particular to novel safety joint. Novel safety joint, including top connection, connecting cylinder, connection dabber and lower clutch, wall connection in top connection lower part and the connecting cylinder upper portion, connecting cylinder lower part cover are on connection dabber upper portion, and the connecting cylinder passes through shear pin and loose key connection with the connection dabber, and the connecting cylinder lower extreme is opened to insert and is closed the groove, and connection dabber lower extreme passes through left -handed screw to be connected with the lower clutch, and the lower clutch upper end sets up the spacer pin, and the spacer pin can move about in the groove is closed to inserting of connecting cylinder. The utility model discloses simple structure processes easily and installs, convenient operation, and safe and reliable can satisfy the various unfreezing operation needs of unusual stick