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Aiming at the current diesel engine exhaust gas recirculation cooling control system affected by time lag, which causes the system opening trend to be inconsistent with the set trend and the exhaust gas recirculation effect is poor, a diesel exhaust gas recirculation cooling control system based on adaptive LS-SVM is proposed. The 40-pin AT89C51 single-chip microcomputer is used as the core component of the electronic control unit, and the position sensor is used to send load signals to the system, and the temperature sensor is used to transmit the signals and feedback to the D/A converter. In the D/A converter, the feedback signal enters the register in a serial or parallel manner, and outputs the current and voltage after the conversion, and controls the opening of the system valve during exhaust gas recirculation. The servo pump adopts a cooling system to provide a hydraulic power source for the system. On the basis of the least square support vector machine, the linear equations are solved to solve the optimization problem, and the control error is eliminated. Adjust the speed of the system according to the size of the control difference. It can be seen from the test results that the opening trend of the system is consistent with the setting opening trend, and the error of the setting opening degree is 1 opening degree, indicating that the system has good steady-state characteristics and effectively overcomes the time lag problem in the system. The recycling effect is better.