The invention provides a direct-current earthing and alternating current-directing current series simulation device which is convenient to use and test and capable of overcoming shortcomings in the prior art and performing simulation detection conveniently, visually and quickly. The direct-current earthing and alternating current-directing current series simulation device comprises an operation portion and a control portion which are connected with a power supply, wherein the control portion comprises a keyboard and a display device which are connected with a CPU, and the operation portion comprises an insulation resistor, a bridge resistor, a ground capacitor and a cable capacitor which are connected in sequence and connected onto a wiring terminal group through change-over switches. The direct-current earthing and alternating current-directing current series simulation device has obvious advantages by especially adopting the wiring terminal group capable of performing connection conveniently. By means of the wiring terminal group, connection of the devices is facilitated, and loss caused by misoperation is reduced.