The utility model relates to a simple capacitor. The simple capacitor comprises a housing, a rigid insulation inner container, capacitor cores, copper wires, a switch, an end cover, screwing points, buckles, electrodes, line connection points and an insulation separator plate; the rigid insulation inner container is connected with the capacitor cores; the switch is connected with the housing; the copper wires are connected with the line connection points; the end cover is connected with the screwing points; the screwing points are respectively connected with the electrodes; the copper wires are connected with the screwing points; the buckles are respectively connected with the electrodes; the capacitor cores are connected with the line connection points; and the capacitor cores are connected with the insulation separator plate. The simple capacitor is simple in structure, a bad capacitor core can be simply replaced by an operator, the capacitor core can be easily replaced when the wires are accessed to the capacitor core, the two steel buckles stretch out of the top ends of the electrodes, and therefore the capacitor can be effectively prevented from sliding on a circuit before being fixed.