The invention belongs to the field of devices related to electric fluid hydrodynamic jet printing and discloses an electric jet printing nozzle with a composite detection function. The electric jet printing nozzle with the composite detection function comprises a nozzle module, a single-camera observing module and a plurality of process observing modules, wherein the single-camera observing moduleand the process observing modules are installed above and around the nozzle module; by means of arranging and matching of a plurality of reflecting mirrors, four different light paths of the front, the back, the left and the right are formed; different observed images of four dimensions of the jet printing pattern, the liquid drop spray-out process, the liquid drop flying process and the liquid drop falling process are reflected to the same dimension; then shooting is performed in a unified manner by the upper phase; and meanwhile, according to different nozzles and process requirements, theangle and other parameters of the reflecting mirrors are adjusted to observe observing objects at different positions. By means of the electric jet printing nozzle with the composite detection function, electric fluid hydrodynamic jet printing, the jet printing result, the process observing and other functions can be achieved, and meanwhile the beneficial effects that the structure is compact, operation and control are convenient, the observing precision is high, and the application range is wide are achieved.