The invention provides a high-precision controllable analog total air temperature signal device. The device comprises a master control computer, a data collection card, an analog switch, and a parallel resistor network; the parallel resistor network is realized by adopting a way of connecting multiple weighted resistors in parallel; the analog switch is electrically connected with each resistor; an I/O port is arranged on the data collection card, and the I/O port controls the analog switch through output digital quantity, and the master control computer is electrically connected with the datacollection card through a bus. By adopting the parallel resistor network and replacing a relay with the analog switch, the precision of the analog sensor resistor is guaranteed on the basis of improving the reliability.