Oiling agent control method suitable for polyester filament POY bottom layer yarn

An oiling agent control method suitable for polyester filament POY bottom layer yarn comprises the steps that an upper computer, a PLC, a frequency converter, a gear motor, an oiling agent pump and an oil nozzle are interlocked to finish oiling of tows, and finally the tows are wound around a paper tube installed on a winding head to form a cylindrical spinning cake. The method is characterized in that an upper computer sends out different oiling quantity instructions A and B according to a bottom layer yarn winding instruction A and a spinning cake winding instruction B after bottom layer yarn winding is finished given by a winding head, the oiling quantity of the instruction A is larger than that of the instruction B, and the increasing range is 5%-10%. By means of a series of interlocking control, more oiling amount is obtained on the bottom layer silk, and after follow-up balance placement, packaging operation and bottom layer silk oiling agent adsorption by a paper tube, the tow oiling amount meeting the