The invention relates to a cylinder cover grabbing device which comprises a connecting column. A flange plate is arranged at the upper end of the connecting column, a grabbing frame is fixed to the lower end of the connecting column, the grabbing frame comprises an upper plat plate at the upper end of the grabbing frame and two side plates correspondingly located on the front side and the rear side of the grabbing frame respectively, the left side and the right side of the upper flat plate are connected with turnover air cylinders in a hinged mode, the other ends of the turnover air cylinders are hinged to rotary clamping plates, and the middles of the rotary clamping plates are correspondingly hinged to the two side connecting plates respectively. Slide rails are arranged on the outer side faces of the rotary clamping plates, upper carrier plates are arranged on the upper portions of the slide rails, rotary strips are arranged in the middles of the slide rails, lower carrier plates are arranged on the lower portions of the slide rails, and inserting arms are arranged on the outer end faces of the lower carrier plates. A cylinder cover can be flexibly inserted and taken, the stretching distance of the lower carrier plates on the slide rails can be controlled by controlling first air cylinders and second air cylinders, and therefore the stretching length of the inserting arms is adjusted, and the adjusting flexibility of the inserting arms is increased.