The invention discloses a remote temperature controller for transmitting computer temperature control information by using a power line carrier, which consists of a transmitting system and a receiving system. The transmission system is connected with the receiving system via a power grid. The transmitting system consists of a central machine temperature presetting programmer, a duplex modem I, a high voltage isolator I, a high voltage isolator II, a site return information processor and a digital display I; and the receiving system consists of a central machine temperature control programmer,an adapter, a single chip, a modem III, a modem II, a high voltage isolator III, a high voltage isolator IV, an ABL (Atlas Basic Language) code amplifier, a full wave rectification detector, a singlechip decoder, a PID (Proportion Integration Differentiation) temperature controller, an actuator element and a temperature sensor. The invention not only realizes the remote temperature control but also saves the cost.