The invention discloses an electric differential device with a torque fixed-direction distribution function. The electric differential device comprises a main drive mechanism, a bevel gear differential device body, a TV control drive mechanism for outputting control power, a first single-row planetary gear system, a second single-row planetary gear system and a third single-row planetary gear system; a first planet carrier is coaxially and fixedly connected with a first half shaft, a first gear ring is connected with the control output end, and a first sun gear is arranged on the first half shaft through a bearing in a supported manner; a second gear ring is fixed to a drive bridge shell, and a second sun gear is fixedly connected with the first sun gear; the second sun gear is arranged on the first half shaft through a bearing in a supported manner; a third sun gear is fixedly connected with the first half shaft, a third planet carrier is fixedly connected with a second planet carrier, and a third gear ring is fixedly connected with a differential device shell; and the second single-row planetary gear system and the first single-row planetary gear system have the same characteristic parameters. By means of the electric differential device, the drive torque of an automobile can be distributed to wheels on the left side and the right side in a fixed-direction manner according to the control requirement of control logic.