The utility model relates to a positioning structure for a communication box, which comprises a mounting plate, a bin body is arranged on the front surface of the mounting plate, a cover plate is arranged on the front surface of the bin body, an adjusting mechanism is arranged on the bin body, a first positioning mechanism is arranged on the adjusting mechanism, and a second positioning mechanism is arranged on the bin body. According to the positioning structure for the communication box, the installation plate is fixed to the wall, the bin body is installed on the installation plate, then the communication box is placed between the first positioning mechanisms, the adjusting mechanisms are used for driving the communication box to be adjusted up and down to the proper position, and therefore the communication box can be conveniently positioned. When the communication box is installed, the cable penetrates through the bin body to be connected with the communication box, the second positioning mechanism is used for positioning the cable, finally, the cover plate is installed on the bin body, when a worker operates improperly and installs the communication box to an improper position, reinstallation is not needed, damage to the wall is reduced, time and labor are saved, and the installation effect is improved.