The invention discloses a photoelectric mixing sliding ring used for a cable drum. The photoelectric mixing sliding ring comprises an electric sliding ring body, an optical fiber sliding ring body and a fixed supporting column. The electric sliding ring body comprises a rotor and a stator, wherein the rotor is a rotary bottom plate fixed to a rotary shaft, the bottom plate is fixedly provided with a rotary supporting column, the rotary supporting column is fixedly provided with a conductive ring, an electric sliding ring main body and a rotary support, and the conductive ring, the electric sliding ring main body and the rotary support are alternately arranged in a sleeved mode; the stator is an electric brush which is fixed to the fixed supporting column through a brush frame, and the electric brush is in contact with the conductive ring. The optical fiber sliding ring body comprises an upper sleeve, a lower sleeve and an outer sleeve, the inside of the upper sleeve and the inside of the lower sleeve are respectively provided with an optical fiber collimator, a bearing is arranged between the two optical fiber collimators and the outer sleeve, the lower sleeve is fixed to a current collection box, the lower sleeve and the optical fiber collimator inside the lower sleeve are fixed and do not rotate, and the upper sleeve and the optical fiber collimator inside the upper sleeve rotate along with the conductive ring. The electric sliding ring body and the optical fiber sliding ring body are assembled together, and the problems that in the prior art, the axial size is exceedingly large, the coaxiality is not high and winding is complicated due to the fact that the electric sliding ring body and the optical fiber sliding ring body are separately assembled are reasonably solved.