The utility model discloses a temperature and humidity alarm which comprises a temperature and humidity sensor, a main control chip and a communication circuit, wherein the temperature and humidity sensor is used for acquiring a temperature and a humidity of outside; the main control chip is connected to the temperature and humidity sensor, and used for sending values of the temperature and the humidity of the temperature and humidity sensor to the communication circuit; and the communication circuit is connected to the main control chip and used for outputting the values of the temperature and the humidity to a human-computer interaction interface in real time. By applying the temperature and humidity alarm, the problem of labor waste caused by needing to frequently regulate the temperature and the humidity by a user due to incapability of integrally controlling the temperature and the humidity in a monitoring range according to historical data of the temperature and the humidity because the user can only regulate the temperature and the humidity in the monitoring range according to a current alarm value, the user can integrally regulate the temperature and the humidity according to the characteristics of the temperature and the humidity in different time periods through a temperature and humidity record displayed by the human-computer interaction interface, thus the user experience is improved.