The invention discloses a portable three-channel near-deep-UV Raman spectrometer. The spectrometer comprises a near-deep-UV laser emitter, a laser spot shaping device, a first beam splitter, a zooming or non-zooming lens, a second beam splitter, a third beam splitter, a relay optical system, a point-to-line optical system, a spectrum forming system, an optical or mechanical sample scanning system and a data processing and wirelessly transmitting-receiving system. After Raman, fluorescent and visible/laser channels are fused in the point-to-point manner in real time, the whole sample is scanned, and data processing such as spectral separation, peak positioning, spectral library establishment and substance identification is carried out. The portable three-channel near-deep-UV Raman spectrometer has the advantages including that the flexibility and resolution are high, illumination points are large, the detection distance is long, rapid onsite non-contact measurement can be implement in the sun, and the spectrometer is relatively safe for the eyes.