The utility model discloses an integrated online monitoring device of a parallel capacitor. The integrated online monitoring device of the parallel capacitor comprises a shell, an energy acquiring module, a sampling module, a current signal cable and a power cable; the shell is internally equipped with the energy acquiring module and the sampling module; the energy acquiring module is connected with the sampling module through the power cable; the current signal cable is lead out from the shell; the energy acquiring module comprises an iron core, an energy acquiring coil, a front end impact protection module, a rectifier module, a filter module, a voltage protection energy release module and a DC / DC conversion power output module; the iron core sleeves on a binding post of the parallel capacitor; one side of the iron core is provided with the energy acquiring coil; the energy acquiring coil is sequentially connected with the front end impact protection module, the rectifier module, the filter module, the voltage protection energy release module and the DC / DC conversion power output module; and the sampling module includes a current sensor module and a data acquisition module. In the utility model, the integrated online monitoring device of the parallel capacitor is great in integration, high in reliability, low in cost, and simple in structure.