The invention discloses a constant temperature baking oven control system for processing aluminum foil composite heat-insulating material. The constant temperature baking oven control system mainly comprises a baking oven, a heater, a temperature measuring module, a signal conditioning circuit, a control unit, an operation keyboard, an LCD display module, a photoelectric isolation module, a power amplification module and a bidirectional silicon controlled rectifier, wherein the heater is installed in the baking oven, the two ends of the bidirectional silicon controlled rectifier are installed on the heater, a platinum resistor is arranged in the temperature measuring module and installed in the baking oven, the signal conditioning circuit is connected with the temperature measuring module, the control unit employs an MSP430 single-chip microcomputer, the signal conditioning circuit and the operation keyboard are connected with the control unit, the LCD display module and the photoelectric isolation module are connected with the control unit, the power amplification module is connected with the photoelectric isolation module, and the control end of the bidirectional silicon controlled rectifier is connected with the power amplification module.