Compressed　air　energy　storage　has　garnered　much　attention　due　to　its　advantages　of　long　lifespan,　low　cost　and　little　environmental　pollution,　and　pneumatic　motor　is　equally　so　due　to　its　advantages　of　low　price,　easy　operation,　and　wide　power　range.　In　this　paper,　a　small　power　generation　energy　storage　test　device　based　on　pneumatic　motor　and　compressed　air　is　built.　The　effects　of　regulator　valve　pressure　and　electronic　load　current　on　temperature　difference,　pressure　difference,　expansion　ratio,　rotating　speed,　torque,　power　output　of　pneumatic　motor,　and　efficiency　of　generator　are　studied　by　experiments.　The　experimental　results　show　that　the　temperature　difference,　pressure　difference　and　expansion　ratio　of　pneumatic　motor　increase　with　the　increase　of　regulator　valve　pressure　and　electronic　load　current.　The　power　output　of　the　pneumatic　motor　and　the　efficiency　of　generator　increase　at　first　and　then　decrease　with　the　increase　of　the　electronic　load　current,　while　the　power　of　pneumatic　motor　and　the　efficiency　of　generator　increase　with　the　increase　of　regulator　valve　pressure.　The　maximum　power　output　of　the　pneumatic　motor　is　about　290.3　W,　and　the　maximum　efficiency　of　the　generator　is　about　75.1%.　©　2021　Elsevier　Ltd