The invention relates to a grassland vegetation coverage measurement device. The grassland vegetation coverage measurement device comprises a rectangular frame surrounded by rectangular plates, and two pull rope devices are arranged in the rectangular frame; the two pull rope devices are respectively arranged on two neighboring rectangular plates; the pull rope comprises two pull rod components arranged in the rectangular frame and a pull rope component arranged on the two pull rod components; the pull rod component comprises a fixed rod fixed on the rectangular plate, a movable rod arranged in a manner of being parallel to the fixed rod, and a connection rod, wherein the two ends of the connection rod are respectively connected with the fixed rod and the movable rod through hinge joint, the fixed rod and the movable rod are respectively and evenly provided with corresponding through holes; the pull rope component comprises a clamped ball, a fluorescent rope and an elastic rope, wherein one end of the fluorescent rope and one end of the elastic rope are respectively fixed on the clamped ball, the other end of the fluorescent rope and the other end of the elastic rope respectively pass through corresponding through holes on the fixed rods and the movable rods and then are connected, and thus, an upper layer of grid lines and a lower layer of grid lines tensioned between the twofixed rods and the two movable rods are formed.