The invention discloses a portable breast milk analyzer. The analyzer includes a casing provided with a display; an infrared light source transmitter, a single-chip microcomputer circuit board whose circuit is an analog circuit and a signal acquisition board are arranged in the casing; the single-chip microcomputer circuit board is provided with a photosensitive device; the signal acquisition board is provided with a signal processor; and the casing is provided with a groove, the side wall of the groove is made of light transmission materials, and the groove is arranged between the infrared light source transmitter and the photosensitive device. The beneficial effects of the analyzer are that the analyzer is reasonable in design, simple in structure, small in size, convenient to carry andshort in detection period; the analyzer adopts an open liquid adding manner so that inputting through pipelines is not needed, and cleaning is also not needed; and therefore, cross contamination can be avoided, and measuring precision can be enhanced.