Backrest adjusting mechanism and a seat with the same

A backrest adjusting mechanism, wherein comprising an adjusting base, a cushion, a supporting frame, a backrest, an air pressure rod, a connecting rod and a steel wire core;

• said cushion is fixed to a top of said adjusting base;
• said supporting frame is rotationally connected to a rear end of said base;
• said backrest is fixed on said supporting frame;
• said air pressure rod is rotationally connected with said supporting frame;
• said rear end of said base is provided with a fixing frame;
• one end of said connecting rod is rotationally connected on said fixing frame, the other end of said connecting rod is rotationally connected with a movable rod of said air pressure rod;
• said connecting rod and said fixing frame are both provided with a limiting block;
• when said backrest is used, two of said limiting blocks are propped against each other to fix said backrest at a specific position;
• one side of said adjusting base is actively connected with a buckle plate;
• one end of said steel wire core is fixed on a valve core switch of said air pressure rod, the other end of said steel wire core is fixed on said buckle plate.