The utility model discloses a multifunctional armrest, which comprises a bottom shell and a face shell, wherein a back and forth moving type track is arranged on the bottom shell, and a big sliding block capable of reciprocally moving back and forth along the back and forth moving type track is arranged on the back and forth moving type track; a left and right moving type track is arranged on the big sliding block, and a translating sliding block capable of moving left and right along a left and right moving type track is arranged on the left and right moving type track; a protrusion is formed on the surface of the translating sliding block; an angle regulator has a mounting hole matched with the protrusion; the angle regulator is arranged on the protrusion of the translating sliding block in a rotating mode through the mounting hole, and can regulate angle along the arc-shaped edge of the translating sliding block; and the angular regulator is fastened on an armrest support of a chair. The multifunctional armrest is easy to manufacture, simple in assemble and comfortable for use, can slide back and forth and left and right and can regulate angle along a horizontal plane.