Pumping unit is a kind of machinery and equipment used to extract oil, commonly known as "kowtow machine". The pumping unit is the most important lifting equipment in the rod pumping system. According to whether there is a beam, it can be divided into beam pumping unit and beamless pumping unit. The application of frequency converters in several types of mainstream pumping units further improves the efficiency of the pumping unit's oil extraction system, saves energy, reduces mining costs, realizes economic and effective development of oil fields, and realizes digital management and intelligent control in the true sense.