A digital direction finder is characterized in that an electronic compass is fixed at a compass fixed end through a compass fixed leg; the compass fixed leg and the compass fixed end are in threaded connection; the compass fixed end is in threaded connection with a main part; one end of the main part is connected with a control circuit, and the other end thereof is in threaded connection with a battery housing; the battery housing is in threaded connection with the rear end cover of the battery housing; a battery pack is mounted inside the battery housing; the compass fixed end is connected with the front end cover of a protection cylinder; the front end cover of the protection cylinder is in threaded connection with the protection cylinder; the protection cylinder is in threaded connection with the rear end cover of the protection cylinder; the front end cover of the protection cylinder, the protection cylinder and the rear end cover of the protection cylinder constitute a round protection structure; and the control circuit comprises a microprocessor, a memorizer, a display screen, buttons, a 232 chip and a linearity manostat, wherein, the microprocessor is communicated with the electronic compass via the 232 chip, and a switch is arranged at the front end of the control circuit. The utility model adopts the electronic compass and the microprocessor which have the advantages of high precision and strong self calibration capability, so that the testing result is accurate; the monitoring precision is high; and the testing process is intelligentized.