Abstract: A compound dual unidirectional friction hinge comprises a pivot pin and two rotary members fastened toward the same direction and being pivotally engaged with the pivot pin. The rotary members have respectively a fastening section and a pivot barrel connecting to the fastening section and pivotally engaging with the pivot pin. The pivot barrel has an edge at one end thereof to form an action gap with the juncture of the fastening section and pivot barrel. When either one of the rotary members is turned, the action gap of the rotary member becomes an open state while the action gap of the non-turning rotary member becomes a closed state and grips the pivot pin thereby to form the unidirectional friction hinge fastened toward the same direction.