Ultra thin synchronous jacks are mainly used for equipment installation and lifting operations in various industries such as power construction, machinery manufacturing, mining, railway bridges, shipbuilding, etc. The jack is designed with a safety pressure holding device to facilitate safe operation. And four sets of shut-off valves are designed, which can control the synchronous lifting and lowering of the jack at any time. The connection of this device adopts high-pressure rubber hose and quick connector connection, which is very fast to use. This series of jacks is particularly suitable for use in narrow spaces.