The invention discloses to a mother linear isolated grounding combined switch which comprises a shell body, a first conductor, a grounding contact, a second conductor and a moving contact. The shell body has two first openings set in the first direction and two second openings set in the second direction, and the first direction is vertical to the second direction. A first static contact is directly and concavely set on the first conductor. The grounding contact is connected with the shell body and arranged in the shell body. A connection seat is convexly set within the inner end of the second conductor is bent into a concave connection seat. The connection seat is provided with a second static contact, a moving channel is formed in the second static contact, is vertical to the first direction and is located between the first static contact and the grounding contact. The moving contact can be linearly connected in the moving channel in a movable way, and the moving contact moves linearly to contact the first static contact and the grounding contact selectively. In addition, the axis of the first static contact, the moving channel of the second static contact, the moving route of the moving contact and the axis of the grounding contact are coincident and paralleled to the second direction.