The invention discloses a temperature measurement device and a temperature measurement system, and relates to the technical field of measurement devices or systems of the temperature. The temperature measurement device comprises a CT power supply unit, a resistance calculation unit, a data processing unit, an address control unit and a data sending-receiving unit; the temperature measurement system comprises multiple temperature measurement devices and a temperature management terminal; data interaction is carried out between each temperature measurement device and the temperature management terminal through a wireless network; the temperature management terminal comprises the data sending-receiving unit, the data processing unit, a data output unit, a data display unit and a power supply unit. As data transmission for the acquired temperature information is carried out by adopting a wireless mode, the temperature measurement device and system achieve the characteristics of being convenient to use, safe, steady, reliable and the like.