The invention relates to a photoelectric composite attenuator. The photoelectric composite attenuator comprises an input interface and an output interface, the photoelectric composite attenuator alsocomprises a first photoelectric composite attenuation module and a second photoelectric composite attenuation module arranged between the input interface and the output interface, the first photoelectric composite attenuation module and the second photoelectric composite attenuation module are arranged in a coaxial manner, the first photoelectric composite attenuation module and the second photoelectric composite attenuation module can relatively rotate around the axis, the first photoelectric composite attenuation module and the second photoelectric composite attenuation module both comprisesan electric signal transmission channel and an optical signal transmission channel arranged at the periphery of a wire, neutral dark-color glass is arranged in the optical signal transmission channels, and the neutral dark-color glass is in the tile shape. According to the photoelectric composite attenuator, the transmission of electrical signals in a photoelectric composite cable is not affected, the transmission power of an optical fiber can be controlled in a reasonable range, and comprehensive control of the transmission of the electrical signals and optical signals is realized.