The present invention provides a modular wall assembly with prefabricated wires, comprising: a base and multiple modular wall frames. The base is provided with wires and extends out of the base, and at least one connecting groove and a plurality of convex rings are fixed on the base, and the connecting groove is provided with a plurality of conducting parts, and the conducting parts are in electrical communication with wires in the base. The modular wall frames are provided with wires, and comprising: at least one connecting stud, at least one upper connecting groove, a plurality of upper convex rings, a plurality of lower grooves, and a locking device. Through those structure, the workers can quickly build a wall with strength not much different from a normal wall, while also setting up the indoor devices by using the prefabricated wires in the modular wall frame.