The invention discloses an intelligent temperature and humidity monitor for a greenhouse. The monitor comprises a monitor main unit and at least one monitor auxiliary unit, wherein the monitor auxiliary unit is used for measuring the temperature and the humidity; the monitor main unit comprises a liquid crystal display, keys, a receiving antenna and a main control unit; the main control unit comprises a wireless receiving module, a key circuit, a liquid crystal display drive, a GPRS (General Packet Radio Service) communication module and a main controller; the wireless receiving module, the key circuit, the liquid crystal display drive and the GPRS communication module are all electrically connected with the main controller; the monitor auxiliary unit comprises a temperature and humidity sensor, a sending antenna and an auxiliary control unit; the auxiliary control unit comprises an auxiliary controller and a wireless sending module, and the temperature and humidity sensor and the wireless sending module are both electrically connected with the auxiliary controller. According to the monitor, the temperature and humidity measuring part is separated from the control part, and a user conveniently places measuring points according to different requirements and can receive alarm information through a mobile phone when the temperature and the humidity are abnormal, so that the monitor is convenient to use.