The utility model provides a ring main unit switch simulation device. The method is used for positioning ring main unit fault parts. The ring main unit comprises a DTU and a scheduling background in communication connection with the DTU. The switch simulation device comprises a switching-on loop and a switching-off loop which are connected in parallel. The closing loop is formed by connecting a first relay coil and a first time relay coil in parallel; wherein the normally-closed contact of the second relay and the normally-closed contact of the first time relay are connected in series. And theopening loop is formed by connecting a second relay coil and a second time relay coil in parallel and then respectively connecting the second relay coil and the second time relay coil with a normallyclosed contact of the first relay and a normally closed contact of the second time relay in series, and the closing loop and the opening loop are respectively connected with a closing remote controlcontact and an opening remote control contact which are connected with the DTU in series. According to the utility model, the fault part of the ring main unit can be rapidly positioned, the time is saved, the troubleshooting work intensity is reduced, and the service life is long.