Data link fault diagnosis device with anti-falling function

The utility model provides a data link fault diagnosis device with an anti-falling function, and belongs to the technical field of fault diagnosis mechanisms. The data link fault diagnosis device with the anti-falling function comprises a basic assembly and an anti-falling assembly. The basic assembly comprises a fault diagnosis instrument, a support, a transverse column, a first vertical plate, a first locking piece and a data connector, one end of the transverse column is fixed to the outer wall of the support, the other end of the transverse column is rotationally arranged on the outer wall of the fault diagnosis instrument, and in the using process, the second sliding block is held, the position of the second sliding block on the second sliding rail is controlled, and the data connector is connected with the second sliding block. A second threaded rod is rotated, and the tail end of the second threaded rod extrudes the outer wall of a second sliding rail, so that a second sliding block is fixed on the sec