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The complex underwater environment affects the performance of measuring equipment and sensors under common conditions. Therefore, simulating the underwater temperature and humidity environment is of great significance for the performance testing and calibration of underwater equipment and sensors. In response to the need for precise control of cabin temperature and humidity in an indeterminate airtight cabin, this work focus on a dynamic control system for temperature and humidity. First, the hardware structure and software function modules of the temperature and humidity control system are designed. Secondly, a P-Fuzzy-PID control method is studied, and a fuzzy PID control model of temperature is established, and controls are used piecewise, the method realizes segmented control, gives the final control results of temperature and humidity in reality. Finally, this work realizes the human-computer interaction function of the temperature and humidity control system, and analyzes the control results. The experimental results show that the control system can meet the engineering needs of non-deterministic airtight cabin room temperature and humidity control in reality application process. Compared with traditional control methods, it has the advantages on rapid control response, control accuracy, human-computer interaction friendliness and system intelligence and other aspects have certain advantages.