Stainless steel elbow pipes are widely used in practical engineering. In order to achieve the purpose of operation and economical transportation in pipeline design, it must be as reasonable as possible to solve the problem between the energy loss and energy supply of the fluid in the pipeline in the hydraulic calculation of the pipeline contradiction. The local resistance coefficient of carbon steel elbow pipe type variable parts is a very commonly used hydraulic parameter in the pipe hydraulic calculation. Socket elbow is a common pipe connector. Because of its simple, fast, time-saving, labor-saving, and low installation costs, it is widely used in actual pipe connection. At the same time, its local resistance is large. The effect of water flow is significant. Studying the local resistance coefficient and hydraulic characteristics of socket elbows is of great significance for the optimization of pipe network design and pipeline hydraulic calculation. Since the research on the hydraulic characteristics of PvC socket elbows is still very few, there are relatively many tests and numerical simulations of carbon steel seamless elbows, and the elbows and socket elbows are similar, so they can be used as a reference. Through experimental research and numerical simulation, Muwen analyzed the local resistance coefficient and flow state change of the pipe elbow, and analyzed the hydraulic characteristics and main causes of energy loss of the pipe elbow.