The invention provides a banana stem clamping and cutting composite actuating mechanism. The mechanism comprises a fixing frame, an automatic clamp and a cutting saw, wherein the automatic clamp is mounted on a lower mounting base of a fixing frame and comprises a first hydraulic cylinder, the first hydraulic cylinder is horizontally fixed to the lower mounting base, and the front end of a Y-shaped pull rod is in butt joint with the upper and lower end faces of a bearing and fixed by an anti-rotation pin shaft; the rear end of the Y-shaped pull rod is fixedly connected with a retractable shaftof the first hydraulic cylinder, and a left L-shaped clamp arm and a right L-shaped clamp arm are in pivot joint with the lower mounting base separately through a first pin shaft and a second pin shaft; the cutting saw is mounted on an upper mounting base of the fixing frame. The banana stem clamping and cutting composite actuating mechanism is simple in structure and ingenious in design; by structurally combining the automatic clamp with the cutting saw, the composite actuating mechanism simultaneously has the automated operation functions of cutting, clamping and hanging banana stems, automated harvesting of bananas is realized, and the picking efficiency is high.