The utility model discloses a supporting component of bridge inspection trolley rail -engaging pendant and constitution, the utility model discloses a bridge inspection trolley rail -engaging pendant, when specifically using, will at a distance of the certain distance install the above -mentioned rail -engaging pendant in bridge truss below, height through the track supporting part on the component under the structural adjustment of adjustment altitude mixture control, thereby the difference in height between each the rail -engaging pendant after feasible the erectting is in the within range that walking beam can level and smoothly pass through, thereby avoid the height error between the different rail -engaging pendants, cause walking beam the condition that the card ends unable walking to appear, guarantee that the inspection trolley is steady and pass through smoothly.