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The mixed interference generated by intentional electromagnetic waves and electromagnetic transmission waves of automotive instruments reduces the stable operation ability of the automotive instrument cluster, causing instrument equipment failure. To avoid the occurrence of the above situation, design an intentional electromagnetic interference time-space joint separation system for the automotive combination instrument. In the stepper motor drive circuit, set up a car combination instrument controller, separate the power supply from the PCB circuit board, and intentionally electromagnetic interference digital sensors. Assign the spatial and temporal source addresses of intentional electromagnetic waves, determine the range of pulse parameters by calculating the flatness of interference signals, and achieve the analysis of spatial and temporal interference effects of intentional electromagnetic waves in automotive combination instruments. Estimate the number of intentional electromagnetic interference signals, follow the processing principles of signal decomposition, solve the joint separation correction function, and achieve joint separation of electromagnetic interference. The experimental results show that the designed system can separate intentional electromagnetic waves in mixed signals according to different spatial and temporal standards, without reducing the stable operation ability of the vehicle combination instrument due to mixed interference.