The invention discloses a multi-wavelength laser modulation one-dimensional bar code reader and an implementing mode of the multi-wavelength laser modulation one-dimensional bar code reader. The bar code reader comprises laser tubes, collimating lenses, a light beam combiner mirror, a reflecting mirror, a photoelectric receiving sensor and an analog-digital decoding circuit. The multiple laser tubes are arranged, wavelengths of lasers emitted by the laser tubes are different, each laser tube corresponds to one collimating lens, the lasers emitted by the laser tubes enter the light beam combiner mirror through the corresponding collimating lenses, a laser synthetic beam is irradiated on the reflecting mirror, the lasers are reflected by the reflecting mirror and then irradiated on one-dimensional bar codes, and the photoelectric receiving sensor receives information reflected by the one-dimensional bar codes, converts optical signals into electric signals, and then sends the electric signals to the analog-digital decoding circuit. The multi-wavelength laser modulation one-dimensional bar code reader can eradiate interference of light of the external environment, the defect that one-dimensional bar codes which are printed in the color similar to the color of the lasers can not be correctly read in the prior art is overcome, and the multi-wavelength laser modulation one-dimensional bar code reader has the advantages of being wide in application occasions and accurate in recognition.