The utility model discloses a portable projection system suitable for an office. The portable projection system comprises a mobile projection stand which comprises a trolley body. The trolley body is provided with platforms, and a small fan is embedded in the platform. The lower ends of the supporting legs of the trolley body are sleeved by bushings which are provided with threaded holes. The bushings are fastened with the supporting legs of the trolley body via screws. The lower ends of the bushings are provided with travelling wheels. The supporting legs of the rear end of the trolley body are provided with through holes. The left end and the right end of a scroll type projection curtain are provided with supporting rods which are inserted into the through holes of the supporting legs of the rear end of the trolley body. The rear end of the scroll type projection curtain is provided with sucking discs. The lower end of the trolley body is provided with a storage battery. A projection instrument is arranged on the platform. The portable projection system is convenient to use, small in space occupation, convenient to move and low in cost. The small fan is used for cooling so that the service life is increased. The application occasions of the portable projection system are expanded by the storage battery. Adjustment of height of the trolley body is realized by the bushings so that the portable projection system is suitable for people with different heights. When the portable projection system is not used, the portable projection system can also be used as a storage stand or a small trolley.