Abstract: A structure of retractile umbrella cover and knockdown umbrella stand comprising a box body composed of an upper and a lower box elements, two holder elements, a plurality of supporting stands, cross fasteners and umbrella covers. Each box element upon incorporation with a holder element, some supporting stands and cross fasteners can form an umbrella stand unit, and a plurality of such units can be used in combination by means of connection with connectors for placing of umbrellas in umbrella covers, on hanging of them on stubs on the holder elements. Bottom of the umbrella cover is used to keep water dropped from umbrella. The present invention can be knocked down and have its components kept in the box body which is small in volume and easy in storage as well as carriage since the box is designed with handle for such purpose.