The invention discloses a wavelength division multiplex light receiving assembly. The wavelength division multiplex light receiving assembly comprises a plane light waveguide integrated wavelength division multiplex chip (1), a light detector chip array (2) and an optical fiber assembly (3), wherein a coupling port (31) of the optical fiber assembly (3) is coupled and stuck with an input end of the plane light waveguide integrated wavelength division multiplex chip (1); the light detector chip array (2) is located under an output end face (12) of the plane light waveguide integrated wavelength division multiplex chip; light sensitive faces (21, 22, 23, 24...) of the light detector chip array are correspondingly aligned with output waveguides (121, 122, 123, 124...) of the plane light waveguide integrated wavelength division multiplex chip (1); and an included angle of 40-50 degrees is formed between the output end face (12) of the plane light waveguide integrated wavelength division multiplex chip and a waveguide face (13), so that the output end face (12) can be used for outputting light reflection parallel to the waveguide face (13) from the waveguide face to be coupled with the light sensitive faces of the light detector chip array. According to the wavelength division multiplex light receiving assembly, the solution multiplexing of a light signal is finished by the plane light waveguide integrated wavelength division multiplex chip and the output end face of the plane light waveguide integrated wavelength division multiplex chip is used as a light reflection face, so that the optical fiber assembly is used as a light input channel. According to the wavelength division multiplex light receiving assembly, a light path structure is extremely simplified, the stability of a light path is enhanced and the coupling packaging difficulty is reduced, so that the integration and low cost of the wavelength division multiplex light receiving assembly are realized.