The invention discloses a multifunctional power supply combiner box. The multifunctional power supply combiner box comprises a combiner box body, a top plate, a box door, a connecting pillar, a lock,a heat dissipation box body, an anti-
backflow switch, a storage battery, fixed links, a rubber
capsule, a component module, an interface, a joint, waterproof rubber, a baffle, an arc-shaped rod, a rotating shaft, a cover plate, magnetic stones, a buckle, a groove, a mounting rod, a mounting plate, a mounting hole, a through hole,
moisture absorption cotton, a heat dissipation scale, a
fan blade, aheat conducting plate and a motor, wherein the rubber
capsule is fixedly arranged at the top of each of the two sides of the inner wall of the combiner box body by virtue of two fixed links, the component module is fixedly arranged on the inner wall of the combiner box body, the box door is mounted one side of the combiner box body by virtue of a hinge, the lock is mounted at a joint of the otherside of the combiner box body and the box door, the waterproof rubber is arranged at the inner sides of the joint of the combiner box body and the box door respectively, and the inner side of the waterproof rubber is connected with the baffle. The combiner box has good waterproof performance and obvious heat dissipation effect, is easy to
mount and store and also has a fire extinguishing function.