The utility model discloses the application relates to communication base station outdoor cabinet. A mobile communication basic station outdoor cabinet cabinet body frame connection structure, includes roof beam and connecting piece, the roof beam includes crossbeam, longeron and erects the roof beam, the connecting piece includes the base block, the base block is equipped with perpendicular roof beam connector, crossbeam connector and longeron connector, and it is perpendicular to erect two liang roof beam connectors, crossbeam connector and longeron connector threes, crossbeam, longeron and perpendicular roof beam all are the cavity section bar, crossbeam, longeron and to erect two liang on roof beam perpendicular, crossbeam, longeron and erect the roof beam roof beam connector is pegged graft in erecting the roof beam cavity through erecting, the crossbeam connector is pegged graft the cavity at the crossbeam in peg graft in the cavity at the longeron and assemble and be in the same place with the longeron connector. The utility model provides a mobile communication basic station outdoor cabinet cabinet body frame connection structure of assembling between the roof beam of cabinet body frame can be realized, the problem of connecting the equipment inconvenience that exists through the welded mode has been solved between the roof beam of the cabinet body frame of current rack.