The invention discloses a connector left-side conveying reversing mechanism of a large-electrical-bar double-head rotating pressing connection machine. The connector left-side conveying reversing mechanism of the large-electrical-bar double-head rotating pressing connection machine comprises a transverse conveying mechanism, a vertical conveying mechanism and a rotating reversing mechanism. The vertical conveying mechanism is installed on a transverse movement plate of the transverse conveying mechanism, and the rotating reversing mechanism is installed on the lateral side of an L-shaped vertical lifting plate of the vertical conveying mechanism. By means of the mode, the connector left-side conveying reversing mechanism has the advantages that connectors are automatically fed, horizontal double-head assembling is adopted for pressing connection, the lateral assembling thrust is reduced, the assembling efficiency is high, and the perpendicularity of the assembled connectors is good.