The invention relates to an automatic shaft gear assembling machine convenient for gear sleeve joint. The automatic shaft gear assembling machine convenient for gear sleeve joint comprises a rack anda power distribution control cabinet, wherein a gear installation rotary table is arranged on the rack and is connected to a gear installation motor; emptying holes matched with shafts are uniformly formed in the gear installation rotary table; gear installation carriers concentric to the emptying holes are arranged on the emptying holes; a gear feeding device, a product feeding device, a gear tightening device and a product discharging device matched with the emptying holes or the gear installation carriers are sequentially arranged on the outer side of the gear installation rotary table; andthe product feeding device comprises a product conveying trough and a product picking and placing device matched with the product conveying trough. According to the automatic shaft gear assembling machine convenient for gear sleeve joint provided by the invention, the gear installation rotary table is arranged, the emptying holes matched with the shaft are uniformly formed in the rotary table, the gear installation carriers are arranged on the emptying holes, and the gear feeding device, the product feeding device, the gear tightening device and the product discharging device are sequentiallyarranged on the outer side of the rotary table, so that the automatic continuous operation of gear installation is realized, and the gear installation efficiency is greatly improved.