Steel cable detection device

The invention relates to a steel cable detection device which comprises a supporting unit, a locking adjusting unit, a braking unit, a rotating unit and an image collecting and detecting unit. The supporting unit comprises an upper supporting piece, a lower supporting piece and a plurality of supporting columns. The locking adjusting unit comprises a first walking assembly, a second walking assembly, an air cylinder assembly and an adjusting assembly. The brake unit comprises a first worm and gear structure, a second worm and gear structure, a first motor and a second motor. The first worm and gear structure and the second worm and gear structure each comprise a worm and a worm gear. The worm wheel drives the first walking assembly and the second walking assembly to move through the first gear transmission assembly. The rotating unit comprises a steering gear ring which is arranged on the inner wall of the upper supporting piece and connected with a worm in the first worm and gear structure in a meshed mode t