The present invention discloses a small tip-enhanced Raman spectrum
measurement device and a detection method thereof. The device comprises a
laser light source module, a dichroscope, an auxiliary calibration module, an objective lens and a three-dimensional translation stage which are sequentially arranged along a light path, and further comprises a long-pass
optical filter, a
laser focus lens and a spectral
signal acquisition module which are sequentially arranged on the transmission side of the dichroscope, and a control and
data processing module which is connected with the auxiliary calibration module, the three-dimensional translation platform and the spectral
signal acquisition module. According to the scheme, a
white light illumination and
microscopic imaging light path, an excitation and collection light path and a Raman
spectrum light path are organically integrated together, a sample, a needle tip and
laser are accurately coupled by utilizing the
white light illumination and
microscopic imaging light path before measurement, the maximum excitation efficiency is realized, and the excitation and collection light path is directly coupled with the Raman
spectrum light path, so that the loss of a
peripheral light path in the measurement process is reduced, and the structure size of the whole
measurement device is reduced while the
spectral resolution capability is ensured by optimizing the light path structure of each part.