Pressure vessel plugging device in reverse osmosis membrane element test system

The utility model discloses a pressure vessel plugging device in a reverse osmosis membrane element test system. The pressure vessel plugging device comprises a support frame, a movable frame and drain plugs, wherein the support frame comprises a left support rod ad a right support rod; the tail ends of the left support rod and the right support rod are respectively arranged on two sides of a pressure vessel through movable screws; the movable frame comprises a left movable rod and a right movable rod; the tail ends of the left movable rod and the right movable rod are connected with the head ends of the left support rod and the right support rod through movable screws; the drain plugs are arranged at the head ends of the left movable rod and the right movable rod through the movable screws in the same way; and the drain plugs are in a cylindrical shape which can be matched with an opening of the pressure vessel to cut in. The pressure vessel plugging device is simple in structure, convenient to operate, good in sealing effect and small in measured result accuracy error, and is capable of well plugging the pressure vessel. In addition, the drain plug loading unloading time can be shortened; the detection speed is correspondingly increased; and the work efficiency is improved.