The invention provides a connecting rod type continuous bag feeding mechanism and an operating method. The mechanism comprises a rack plate. A vertical plate is fixedly mounted at the top of the rack plate through a base. A power device used for providing power is hinged to the vertical plate. The tail end of the power device is hinged to the middle of a rotating arm. The tail end of the rotating arm is hinged to a first rotary shaft. The first rotary shaft is hinged into a first shaft sleeve which is fixed to the side wall of the rack plate. A second shaft sleeve is fixed to the head end of the rotating arm. A second rotary shaft is mounted in the second shaft sleeve. One end of the second rotary shaft is connected with a slider-crank mechanism used for driving the second rotary shaft to rotate. A rotary clamping mechanism used for clamping a bag is mounted at the other end of the second rotary shaft. The bag feeding mechanism can be used for automatically feeding plastic bags in a food automatic packaging process, and accordingly, subsequent bagging and automatic sealing operation are facilitated.