The utility model discloses a simulated testing platform for simulated partial electricity discharge of a cross-linked polyethylene insulated cable. The testing platform belongs to the technical field of electric power cable electricity testing. The testing platform comprises a frequency changing power supply control box whose output end is connected to the input end of an excitation transformer; the output end of the excitation transformer is connected with a lightning arrester and a resonance reactor respectively. The output end of the lightning arrester and a voltage separator are connected with to-be-tested electric cables A to E through switches A to E. The other end of the voltage separator is connected with the frequency changing power supply control box through a signal acquiring wire. A low frequency current sensor is connected with a partial discharge measuring instrument through a synchronizing signal transmission line. A high frequency current sensor is connected with the partial discharge measuring instrument through a partial discharge signal transmission wire. The partial discharge measuring instrument is connected with a photoelectric converter which is connected with a terminal processor. The testing platform of the utility model is capable of simulating five typical faults found in electric cables and substantially increases the recognizing ability of XLPE electric cables to spot partial discharge failures. The testing platform of the utility model is simple to operate and has an increased recognizing ability of XLPE electric cables to spot partial discharge failures. These advantages enable it to be widely applied and to provide reliable performances.