The porous cable tray adopts a porous structure design with regular punched bottom and side plates, which is different from traditional enclosed trays and can provide good ventilation and heat dissipation conditions for the cables laid inside. During the long-term operation of power systems and weak current control systems, cable work will continue to generate heat. The densely arranged ventilation holes can accelerate air convection inside the cable tray, timely dissipate accumulated heat, effectively reduce the aging rate caused by long-term high-temperature operation of cables, and stabilize cable performance. At the same time, the layout of the cable tray holes has been optimized through engineering. On the basis of ensuring ventilation and heat dissipation, it does not affect the overall structural bearing capacity, and can also guide a small amount of condensed water and dust, keeping the interior of the cable tray clean and dry. It is suitable for long-term and high load cable laying scenarios, effectively extending the service life of the cable and cable tray supporting system.