The invention relates to the field of machinery, in particular to a semi-reciprocating rotating mechanism. The semi-reciprocating rotating mechanism comprises a base, a first rotating shaft, at least one poking plate, a connecting rod, a second rotating shaft, at least one pressing plate and a top cover, wherein the base is provided with a first groove and a second groove; the first rotating shaft is connected with the first groove; a first hinge lug is fixedly arranged on the first rotating shaft; the first hinge lug is connected with the base through a spring; the poking plates are connected onto the first rotating shaft in an inserting manner, and are used for driving the first rotating shaft to rotate; one end of the connecting rod is hinged to the first hinge lug; the second rotating shaft is connected with the second groove; a second hinge lug and a hook jaw are fixedly arranged on the second rotating shaft; the second hinge lug is hinged to the relative other end of the connecting rod; the pressing plates are respectively connected with the second rotating shaft and the base, and are used for pressing the second rotating shaft on the base; the top cover is connected with the hook jaw; when the top cover is in press fit with the base, the first rotating shaft is pressed in the first groove; the top cover has a window and a notch formed in the deflection path of the hook jaw; and when the spring changes from the contraction state to the stretching state, the hook jaw deflects from the window position to the notch position.