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Aiming at the problem of the lack of real-time temperature and humidity monitoring in the car in ordinary family cars, a portable temperature and humidity monitoring system for vehicles based on embedded microcontroller is designed. The system consists of vehicle monitoring equipment, Bluetooth communication module and mobile phone APP software. The vehicle monitoring equipment controls the temperature and humidity detection module to collect the temperature and humidity parameters in the car in real time, on the one hand, it is displayed on the local LCD screen, and on the other hand, it is sent to the mobile phone APP software for display through the Bluetooth communication module. The system includes both local and remote alarm threshold setting methods. The initial setting thresholds are as follows, the upper temperature limit is 36 ℃, the lower temperature limit is 18 ℃, the upper humidity limit is 80% RH, and the lower temperature limit is 30% RH. After setting is completed, the vehicle monitoring equipment will determine in real time whether the current temperature and humidity data has reached the early warning threshold, and promptly carry out local sound and light alarms. Taking Harbin City, Heilongjiang Province as an example, multiple tests show that, the system can operate stably in an environment with a temperature range of -18 to 32 °C and a humidity range of 50% to 80% RH. The effective transmission distance of the Bluetooth communication module is 8.2 m. The average delay of Bluetooth communication caused by the span of different temperature ranges is 265 ms. This system has the advantages of strong portability, easy assembly and high-cost performance, and can be widely used in the monitoring of the small and medium-sized vehicles.