The invention relates to an integrated distribution box of an ONU device and a splitter. The integrated distribution box comprises a backboard, two side plates, a base plate, a top plate and a case door, wherein the backboard is provided with an optical cable terminal box, at least one pair of first connecting bolts for fixing the ONU device and at least one pair of second connecting bolts for fixing the splitter, each pair of first connecting bolts is sleeved by a first fixation clamping plate and a first adjusting nut, each pair of second connecting bolts are sleeved by a second fixation clamping plate and a second adjusting nut, the optical cable terminal box is internally provided with a fiber welding disc and a multi-core bunched pigtail fiber, the top portion of the optical cable terminal box is provided with a multi-core fiber flange connector, and the end, which is provided with connectors, of the multi-core bunched pigtail fiber is connected with the multi-core fiber flange connector. Compared to the prior art, the integrated distribution box provided by the invention solves the problem of cable chaos in an ONU casing, simplifies the optical cable welding process, and solves the problem of incapability of unified fixation due to diverse specifications, dimensions and installation modes of ONU devices and splitters which are produced by various communication manufacturers.