The invention discloses a portable seal. The portable seal is mainly composed of a driving member, an inking member provided with an inking cushion, a seal face base capable of containing a seal face cushion, and an operation member which penetrates through a guide groove of one side wall of a seal shell and is connected with the driving member, wherein the driving member, the inking member and the seal face base are installed in the seal shell. The inking member and the seal face base are connected with the driving member in a pivoted mode through pivot rods of combined torsional springs, so that the inking member and the seal face base of the portable seal are operated through the driving member, extend out of the seal shell and unfold outside the seal shell, and the inking member and the seal face base can be folded and closed into the seal shell. Alignment grooves extending inwards from an opening of the seal shell are formed in the inner side faces of one side wall or two side walls of the seal shell. Alignment guide blocks are formed at one side edge or two opposite side edges of the inking member. The alignment guide blocks can be correspondingly matched with the alignment grooves of the inner side faces of the seal shell and guide the inking member to be folded and closed in a certain position in the seal shell, and thus the seal face of the seal face cushion of the seal face base can assuredly make contact with the inking cushion of the inking member for ink soaking and the problem of uneven ink soaking is solved.