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The traditional urban traffic induction signal control system lacks prediction of traffic flow, resulting in poor signal control. Based on the non-linear characteristics of short-term traffic flow, the urban traffic induction signal control system based on WPD-PSO-ESN is designed. In the system hardware design, PC is used as the upper computer, and PLC is used as the lower computer. Use the S7-226 model PLC controller to connect the EM221 digital input module and the EM223 combination input / relay, remove the I / O terminal; select the AT89S51 model collector, send the information it receives to the S7-226 PLC controller; install Single-loop self-healing RS-485 multi-machine communication receiver transmitter, self-repairing single loop. In the software design, the manual and flash control module subprogram flow is designed to realize the state detection of the signal control system. Establish WPD-PSO-ESN traffic flow forecasting model, combine PSO algorithm to optimize parameters, based on traffic flow forecasting results, analyze the capacity of intersections, determine the green time of different signal phases, and design inductive signal control process. It can be seen from the experimental results that the total traffic flow of the system is 310, which is consistent with the historical average traffic flow statistics at the intersection, indicating that the system signal sensing is more accurate and has practical significance for real-time traffic control.