The utility model relates to a routing device of automatic mold changing trolley with following characteristics: long slot pit is opened beside moving track of the mold changing trolley; brackets installed with guide wheels are fixed at the two ends. Guide wheel is wound with circular steel bands, and connection plate is fixed on the steel band. One end of the plate is connected to the mold changing trolley, and the other end is connected with vertical routing square pipe. The vertical routing square pipe passes through the upper layer of the circular steel band and is fixed on it. Lower end of the vertical routing square pipe is connected to U routing square pipe that gets around the lower layer of the circular steel band, and is connected with towing chain. The other end of the towing chain is fixed on the bottom of the long slot pit after bending. Travel switch is installed in the long slot pit; One end of cable is connected to the mold changing trolley, while the other end passes through the vertical routing square pipe, U routing square pipe and towing chain and then connects to power. Protection cover plate with vertical long hole is mounted on the long slot pit. Advantages: Can avoid damage and break of cable, safe use, no influence on operator's work since the whole device is mounted underground.