The burn-in test system is an indispensable piece of equipment in the reliability testing of electronic products. It is designed to simulate high-temperature environments to conduct long-term stability tests on electronic components. This helps identify potential defects early and enhance product quality before they reach the consumer market. Traditional burn-in chambers, however, often face issues such as inadequate control accuracy, energy wastage, and low safety standards. To address these challenges, in this paper, we present the design and implementation of a burn-in furnace monitoring system based on a programmable logic controller (PLC) for heat dissipation and constant temperature control. The system places a PLC at its core as the central control unit. It continuously monitors the temperature inside the chamber in real time using temperature sensors, ensuring that the test environment remains stable. By coordinating the operation of both heaters and exhaust fans, the system can achieve precise temperature control and efficient ventilation management. This sophisticated system ensures optimal conditions for testing, enhancing the accuracy of results. Moreover, the system incorporates a well-designed safety protection mechanism, including over-temperature alarms and automatic shutdown functions, which safeguard the stability of the test process and the safety of operators. This proactive approach significantly reduces risks and improves the overall efficiency and reliability of the burn-in test system.