The present invention relates to a digital capacitor microphone with a USB interface, which comprises a pure capacitance sound head and a bow cap. The present invention is characterized in that a casing is arranged at the lower end of the bow cap, the USB interface is arranged at the lower end of the casing, a tricolored lantern display window is arranged at the upper end of the casing, two circuit boards are arranged in the casing, a high resistance converter, a head amplifier, a signal processor, a signal detector, a tricolored lantern display circuit and an A/D conversion and a D/A converter connected with the USB interface are arranged on the circuit board, a 3.3V voltage regulator and a 5V to 12V converter are arranged at the 5V power supply port of the USB interface, the 3.3V voltage regulator is connected to the A/D conversion and the D/A converter, a 5V to 12V converter is connected to the high resistance converter and the head amplifier, simultaneously, the 5V to 12V converter forms a 48V polarization voltage through a conversion filtering to output to the capacitance sound head; the capacitor microphone realizes the connection between a module-number conversion and a computer, a complicated auxiliary equipment is saved, the usage is convenient and flexible, and the present invention has the practicability.