The utility model provides a seat-back synchronous linkage auditorium chair which comprises a bottom plate, a
handrail fixedly installed on the top face of the bottom plate, a fixing shaft and a connecting shaft fixedly connected to the side wall of the
handrail respectively, a first sleeve shaft rotationally connected to the surface of the fixing shaft, the fixing shaft is connected with the first sleeve shaft through a torsional spring, and the first sleeve shaft is fixedly connected with the bottom of a
cushion. The bottom of the
cushion is fixedly connected with the guide rod, and the end of the first sleeve shaft is movably connected with the guide rod through a linkage mechanism. The seat
cushion, the backrest and the armrests are mounted to form the auditorium chair, the backrest and the armrests can be folded during use, the width between adjacent rows of the auditorium chair can be increased, the linkage mechanism is arranged between the backrest and the armrests, the backrest can be synchronously folded when the seat cushion is stored, rapid operation is facilitated, and the use safety of the auditorium chair is improved. The use convenience of the auditorium chair is improved, the limiting shafts are arranged to achieve limiting of the seat and the backrest, meanwhile, the folding problem of the auditorium chair in the use process can be prevented, and the use performance of the auditorium chair is improved.