The invention discloses a steel wire detection method of vehicle-mounted steel wire rope operation equipment. The steel wire detection method comprises the following steps: moving a steel wire rope along a preset route, wherein the axial direction of the steel wire rope moved along the preset route is parallel to the preset route; setting a first magnetic field and a second magnetic field along the preset route, wherein the first magnetic field and the second magnetic field point to opposite directions along the preset route since opposite axes of the steel wire rope are magnetized when the steel wire rope is moved along the preset rout; monitoring variation of final magnetic flux of the steel wire rope because of irregularity inside the steel wire rope; setting a first image acquirer at a first part, and monitoring variation caused by irregularity of the outer surface of the steel wire rope. Therefore, as two different methods are combined, one method is adopted to judge internal situations, and the other one is adopted to judge outer surface situations, the steel wire rope damage situations can be precisely monitored; in addition, irregularity situations monitored by using the two methods are combined to output abnormity signals to an alarm, the alarm receives the abnormity signals and makes alarm, then convenience can be brought to operators to repair or replace steel wire ropes, and thus safety problems can be avoided.