To solve the artificial feeding and discharging problems for batch processing of disk parts of belt pulley, an automatic feeding and discharging project for economical CNC lathe was put forward to improve production automation level. The mechanical structure was designed with SolidWorks software, which was based on CK6136750 machine tool, including feed mechanism, dischar〖JP2〗ging mechanism and blank impel mechanism. Combining pneumatic technology, PLC technology as well as sensor technology, automatic〖JP〗 feeding and discharging control system was developed, which was loaded to CNC miscellaneous function system. And the full automation of feeding, machining and discharging is come true with operation of onepersonmultimachine, thus cost of production is lessened, the processing time is shortened as well as labor intensity is lightened. The feeding and discharging system has broad application background and market demand.