Energy-saving and efficient vehicular external rear-view mirror

The utility model discloses an energy-saving and efficient vehicular external rear-view mirror, which mainly comprises a mirror holder combination, a mirror surface adjusting mechanical core, a mirror casing, a pressing board, a pressure spring, a washer, a mirror base, an electric folding mechanical core and a cover, wherein the mirror surface adjusting mechanical core and the electric folding mechanical core are fixed in the mirror casing, the electric folding mechanical core is positioned at the joint of the mirror casing and the mirror base, a rotary shaft of the pressing board penetrates into the electric folding mechanical core and the mirror casing and extends out, the pressure spring and the washer are sleeved at the position, between an annular clamping groove and the surface of the mirror casing, of an extending end of the rotary shaft extending out of the mirror casing, and a U-shaped clamping fastener is clamped onto the annular clamping groove of the rotary shaft and then abutted to the washer an