The utility model discloses a rotary hearth furnace charge and discharge automatic unhooking device. The rotary hearth furnace charge and discharge automatic unhooking device comprises a material pushing plate, a material pulling hook and an air cylinder; the material pulling hook is arranged above the material pushing plate; the material pushing plate is arranged in front of the air cylinder; the material pulling hook is connected with the air cylinder through the pushing rod, so that workpieces are accurate to position in charging and discharging; the problems that a material disc is inaccurate in positioning and is clamped frequently because of the rotation of a furnace base for the original charge and discharge are solved; meanwhile, after the workpieces enter the furnace along with the material disc, a charge and discharge mechanism can unhook automatically, and the problem of unhooking difficulty is solved effectively; the running fault rate is reduced greatly; the running reliability is improved.