The invention relates to the field of flow detection, and provides an electromagnetic water meter transmitter based on intermittent excitation and digital signal processing. The transmitter comprisesa single-chip microcomputer minimum system, a power supply management module, an excitation driving module, a signal acquisition module, a man-machine interface module, an external storage module, anoutput module and software; and software is responsible for signal acquisition, signal processing, excitation driving, man-machine interaction and result display; the excitation driving module is usedfor driving a sensor of an electromagnetic water meter to generate a sensor signal; and the signal acquisition module is used for extracting the output signal of the sensor, converting the output signal into a digital quantity and transmitting the digital quantity to a single-chip microcomputer. An excitation mode adopts an intermittent excitation mode, and three-value wave excitation is carriedout once every period; and in algorithmic processing, amplitude demodulation is directly carried out on the acquired sensor output signal, the signal is reconstructed according to a demodulation result, the reconstructed signal is subjected to comb band-pass filtering, amplitude demodulation is carried out again, and instantaneous and accumulated flow is obtained through calculation.