Most precursor observation stations are unattended and are mainly affected by temperature and humidity. When the temperature or the humidity is continuously beyond a certain range, the instruments tend to get damaged, which subsequently affects continuity and integrity of the observation data. In this study, design of a simple temperature and humidity monitoring equipment, which can continuously monitor the temperature and humidity, is proposed. A temperature and humidity data acquisition system was designed based on the STC89C52 single chip. The digital temperature and humidity sensor DHT11 was used to gather the environmental temperature and humidity values, which were displayed on the LCD12864 with Chinese font. The temperature and humidity values were sent to the host computer through the serial port, and the VC 6.0 was used to program the temperature and humidity display interface on the computer. The hardware and software design methods were given, which was validated by experiments. The experimental results show that the system has the advantage of simple structure and can acquire and display the environmental temperature and humidity values in real time. When any of the values are out of range, the system will send messages to handlers for timely processing to ensure that observations are steady and continuous. In conclusion, our temperature and humidity monitoring equipment is successful and has a range of potential applications. This equipment can be highly useful for obtaining environmental parameters in working sites that are extremely far away or considerably difficult for physical access.