Treatment system for oil well produced liquid

The invention discloses a treatment system for an oil well produced liquid. The treatment system mainly comprises an oil well pipe string, a gathering and transporting pipeline, a pressure reducing valve, a gas collecting tank, a low-pressure separator, a stop valve, a pressure transmitter, a mud and sand detector, an oil-phase sand remover, a material level switch, a material level control valve, an auxiliary pipeline, a dehydrator, an oil storage tank, a water collecting tank, a water-phase sand remover, an inclined-plate separator, a sand collecting device, a gas floatation pool, hoses, a standard sand collecting tank, a weighing system and a sewage collecting pool. When the oil well produced liquid containing oil, sand, water and gas passes through the system, sand, water and gas in the oil well produced liquid can be separated, and accordingly, pure oil is obtained for metering and sales, the obtained sand and gas are collected and treated, and clear water obtained through treatment is directly discharge