The invention discloses an umbrella which is provided with a longitudinal upper left opening and a longitudinal upper right opening. Longitudinal magnetically-attracted upper left magnetic strips arearranged on the two sides of the upper left opening respectively. Longitudinal magnetically-attracted upper right magnetic strips are arranged on the two sides of the upper right opening respectively.A cylindrical cover is connected with the lower side of umbrella fabric. The edge of the lower end of the umbrella fabric and the edge of the upper end of the cover are provided with annular magnetically-attracted middle magnetic strips respectively. The lower portion of the cover is provided with an annular bottom magnetic strip which is magnetically attracted to a middle magnetic strip at the upper end of the cover. A downward-extending lower left opening is formed in the position, corresponding to the upper left opening, of the cover. A downward-extending lower right opening is formed in the position, corresponding to the upper right opening, of the cover. Longitudinal magnetically-attracted lower left magnetic strips are arranged on the two sides of the lower left opening respectively. Longitudinal magnetically-attracted lower right magnetic strips are arranged on the two sides of the lower right opening respectively. The umbrella is convenient to use and can be conveniently folded up to be stored.