The present invention discloses a distribution box for preventing a crystal head from loosening. The distribution box comprises a box body, the box body is a rectangular cavity body provided with a door at the front end, the box body is internally provided with a deconcentrator provided with a plurality of network interfaces, the box body is internally provided with two vertically arranged support bars, the support bars are respectively located at left and right ends of the internal portion of the box body, the distribution box also comprises two baffles which are horizontally arranged, the left and right ends of the baffles are sleeved on the two support bars through lantern rings, the two baffles are distributed up and down, the baffles are provided with threaded holes along the forward and backward directions, the threaded holes are arranged at the front ends of the support bars, and the threaded holes are internally provided with location bolts. The distribution box for preventing a crystal head from loosening is configured to allow the crystal head to be stably fixed in the crystal head jack of the distribution box so as to avoid network faults caused by loosening of the crystal head.