Oil purification is an important task faced by major enterprises for a long time,centrifugal purification oil is a high efficiency and low consumption method.Due to the large amount of discharge during the purification process,an automatic drainage device was designed.Then based on NB-IoT technology,online real-time remote monitoring on the oil content of each oil station,pollution and other parameters and oil purification equipment operating parameters was realized to achieve oil control.The measured data from the hot rolling lubrication system of a iron and steel company show that through the use of centrifugal purification and remote monitoring based on NB-IoT technology,the online purification of oil products can be fully realized,the water content of the oil is less than 0.03%,and the pollution degree is below NAS1638-7,and the purified oil can meet the production needs.