Able to cut off locking device of cross slideway

The utility model discloses a cut-off locking device of cross guide rails. A guide rail 1 is provided with a connecting rail 6. The lower portion of one end of the connecting rail 6 is connected with the guide rail 1 via hinges, and the other end is of cuneiform shape. A shackle 7 is arranged at the top portion of the connecting rail 6. A guide groove 9 arranged inside the guide rail can be installed with a locking pin 8 capable of gliding inside the guide groove 9. A spring 10 is provided between the locking pin 8 and an end cover 11. The locking pin 8 is corresponded to the position of the shackle 7. A support 5 arranged on the guide groove 9 is disposed with a touching pole 4 via hinges. The short arm of the touching pole 4 and the locking pin are in toggling correspondence, and the long arm of the couching pole 4 is corresponded to the position of the connecting rail 6. The utility model has the advantages of convenience, simplicity, elaboration and no need of dynamic.