The invention discloses a self-adaptive controlled safe seat in a back row of an automobile and a control method. A seat body can rotate forwards and backwards around a rotating shaft; the lower part of each seat frame is arranged in a corresponding sliding groove and can move forwards in the corresponding sliding groove; an electromagnetic valve is mounted at the side part of each of the sliding grooves; an iron core of each of the electromagnetic valves can extend into a hole in the side surface of the corresponding seat frame to prevent the seat frame from moving forwards; a fixing plate which is not in contact with the sliding grooves is fixedly connected between the rear part of the left side seat frame and the rear part of the right side seat frame; the middle part of the fixing plate is fixedly connected with explosion cylinders in front-back arrangement; the front ends of the explosion cylinders are hinged to the lower end of a pull rod through a cylinder push rod; the upper end of the pull rod is hinged to the bottom surface of the rear part of the seat body, and the pull rod is a telescopic rod with expansion and contraction quantity; the front part of the bottom surface of the seat is hinged to the upper end of a top rod through a front part pin seat; and the lower end of the top rod is hinged to a bottom plate pin seat through the bottom plate pin seat. When the safe seat is under an initial condition, the top rod tilts from a rear upper part to a front lower part; and when being subjected to tensile force exceeding a predetermined intensity, the top rod can be broken, and a protecting condition can be automatically shifted according to the changes of the acceleration of the automobile.