The invention discloses a cable supporting component for a cable well. The cable supporting component for the cable well comprises more than one cable supporting component installed on the inner wallof the cable well; each cable supporting component comprises an inner side plate and an outer side plate; two connection lugs are respectively welded onto two sides of the inner side plate; a lockingscrew passes through the connection lug, so that the connection lug can be mounted on the inner wall of the cable well; the inner side plate and the outer side plate are arranged in parallel; the bottoms of the inner side plate and the outer side plate are connected through a connection plate so as to form a U-shaped integrated body; two supporting cross-bars are welded on the outer side surface of the outer side plate; and more than one cable is laid flatly on the upper end surfaces of the supporting cross-bars. The cable supporting component for the cable well of the invention is particularly suitable for a road with a large number of people and a large traffic volume, can absorb water by means of external pressure, spray the water from an atomizing nozzle by means of a squeezing force,can effectively cool the cables on the supporting components, can extinguish a fire source immediately, has very good fireproof capability and guarantees the use safety of the cables.