Cigarette lighter connecting device

The invention relates to a cigar lighter connecting device, and relates to the field of vehicle-mounted chargers, the cigar lighter connecting device comprises a shell, elastic metal sheets arranged on the shell and used for being connected with the negative electrode of a cigar lighter and a conducting strip used for being connected with the positive electrode of the cigar lighter, the shell comprises an upper shell and a lower shell, the elastic metal sheets are multiple in number and are in an arc shape, and the conducting strip is arranged on the upper shell. The upper ends and the lower ends of the elastic metal sheets are fixed to the upper shell and the lower shell respectively, the elastic metal sheets protrude out of the shell in the radial direction, the multiple elastic metal sheets are circumferentially arranged to form a ball cage, the diameter of the ball cage is larger than that of the shell, a movable ball is arranged in the ball cage, and the diameter of the movable ball is the same as that o