The invention discloses a mobile communication base station outdoor unit cabinet framework connection structure. The mobile communication base station outdoor unit cabinet framework connection structure includes two vertically arranged frames, wherein the side walls of the two frames are provided with a plurality of mounting grooves; connection blocks are inserted in to the mounting grooves; a cross beam is horizontally arranged between the two connection blocks; each connection block has a hollow structure, and two side walls of the connection block are each provided with a groove, and the bottom of the groove is connected with a clamping block through a plurality of springs; the side walls of the mounting grooves are provided with clamping grooves matching the clamping blocks; two side walls of each connection block are each provided with a vertical threaded rod, and the threaded rod penetrates through and extends to the connection block, and one end of the threaded rod in the connection block is connected rotatably through a rotation piece; and the side walls of the two threaded rods are each sleeved with a matched nut. The mobile communication base station outdoor unit cabinetframework connection structure solves the problem that a current cabinet frame cross beam is connected in a welding mode so that the connection is not convenient.