The invention discloses a three-dimensional measuring system based on FM continuous wave laser distance measurement. An existing three-dimensional measuring system based on a pulse method and a phasemethod laser distance measuring principle has relatively low measuring precision. According to the three-dimensional measuring system, the diameter of a laser beam is increased through a beam expanderfor illuminating a to-be-measured area. Diffuse reflection of the laser occurs on the surface of an objective target. The generated echo light is received by a receiving lens and enters a polarization beam splitter. Difference frequency interference with polarization reference light occurs. A generated interference signal is received by a photoelectric detector array. Afterwards, an equal-optical-frequency-interval resampling method is utilized for performing secondary sampling on the interference signal of each pixel of the photoelectric detector array. The high-precision distance information of each pixel of the photoelectric detector array is calculated. According to the pixel dimension and magnification power of the photoelectric detector array, an actual two-dimensional coordinate ofeach point in a target to-be-measured range is obtained; and then according to distance data, high-precision laser three-dimensional measurement is realized. The three-dimensional measuring system has advantages of high distance measuring precision, simple structure and wide measuring range.