A load-assisting cargo bracket for vehicles comprises a main body and an assisting assembly. The main body comprises a bottom, a side rail frame disposed around the bottom, and an accommodating space defined beside the bottom. The assisting assembly comprises a first rod and two second rods. One end of each of the two second rods is connected with the first rod, and the other end of the each second rod is received within a corresponding branch rail of the side rail frame. The each second rod is aligned with the corresponding branch rail of the side rail frame. The first rod is spaced from a back and a top of a vehicle when the two second rods extend out of the side rail frame, and is positioned next to the bottom of the main body when the each second rod is entirely received within the side rail frame.