The invention discloses a PVB (polyvinyl butyral) glass sandwich layer membrane sheet production line which comprises a material burdening device, an extruding machine, a screen exchanger, a mold head, a cooling water tank, a first traction unit, a drying machine, a second traction unit, a thickness measuring instrument, a first heating and tempering unit, a first cooling unit, a second heating and tempering unit, a second cooling unit, a slitting unit, a membrane coating unit and an automatic coiling machine, wherein the extruding machine is connected with the output end of the burdening device; the screen exchanger is connected with the output end of the extruding machine; the mold head is connected with the screen exchanger through a metering pump; a materia inlet of the cooling water tank is connected with the output end of the mold head; the first traction unit is connected with the material outlet end of the cooling water tank; the drying machine is connected with the output end of the first traction unit; the second traction unit is arranged on the material outlet end of the drying machine; the thickness measuring instrument is arranged between the drying machine and the second traction unit; the first heating and tempering unit, the first cooling unit, the second heating and tempering unit and the second cooling unit are sequentially arranged at the rear end of the second traction unit; the slitting unit is arranged at the material outlet end of the second cooling unit; and the membrane coating unit and the automatic coiling machine are sequentially arranged below the rear side of the slitting unit. The PVB glass sandwich layer membrane sheet production line provided by the invention is rigorous in production line structure, a molecular structure of the membrane can be improved and stabilized well through tempering twice, and the membrane sheet performance is improved.