The invention discloses an automatic machining line of a machine shell. The automatic machining line of the machine shell comprises a plurality of machine tools used for machining the machine shell, aclamp used for fixing the machine shell, a fixing device used for fixing the clamp in the machine tool, feeding and discharging devices used for placing the machine shell into the machine tool and taking out the machine shell and a transporting device used for conveying the machine shell to the next feeding and discharging devices; and the feeding and discharging devices comprise pulling and pushing mechanisms used for controlling the machine shell to enter and exit the fixing device and a conveying mechanism matched with the transporting device, wherein the transporting device comprises a transporting mechanism used for transporting the machine shell, a guide mechanism used for changing a transporting direction and an adjusting mechanism used for adjusting the angle of the clamp. According to the automatic machining line, the feeding and discharging of the machine shell can be automatically completed, the labor needed for production of the machine shell is reduced, and the machiningefficiency is further improved; the machine shell can be automatically transported on different machine tools through the conveying mechanism, so that the automatic production is realized, and the production efficiency is improved; and the direction of the clamp can be adjusted through the adjusting mechanism so that the machining requirements of different workpieces can be met.