Lubricating and cooling system and lubricating and cooling method for machine tool cutter

The invention provides a machine tool cutter lubricating and cooling system and a lubricating and cooling method, and relates to the technical field of machine tool machining, the lubricating and cooling system is used for lubricating and cooling a cutter of a machine tool, and the lubricating and cooling system comprises a supply unit, the input end of the flow adjusting unit is connected with the output end of the supply unit; the input end of the pipeline unit is connected with the output end of the flow adjusting unit, and the output end of the pipeline unit is used for transferring the lubricating coolant to the position of the cutter; and the programmable logic controller is electrically connected with the flow adjusting unit and the rotation driving mechanism, and the programmable logic controller is used for reading the torque value of the rotation driving mechanism and controlling operation of the flow adjusting unit according to the torque value so as to control the use amount of the lubricating coo