The invention discloses a overvoltage absorption device of a parallel capacitor. The overvoltage absorption device and a parallel capacitor branch are connected in parallel. The overvoltage absorptiondevice comprises a voltage limiting circuit and a resistance-capacitance circuit, wherein an incoming line end of the voltage limiting circuit is connected to the incoming line end of a field switch,a leading-out end is connected to the leading-out end of the capacitor, and the voltage limiting circuit is used for controlling an overvoltage amplitude of the parallel capacitor branch and absorbing electric energy when the parallel capacitor branch is in an overvoltage state; and the resistance-capacitance circuit is connected in parallel with the voltage limiting circuit, and is used to slowdown a rising speed of the overvoltage and store the electric energy of the overvoltage generated by an in and out state of the parallel capacitor branch. By using the overvoltage absorption device ofthe parallel capacitor, the resistance-capacitance circuit is used to slow down the rising speed of the overvoltage, the voltage limiting circuit is used to limit an amplitude of the overvoltage during the in and out state of the parallel capacitor branch and the overvoltage amplitude is controlled within an ideal range so as to effectively avoid and reduce an impact and a negative effect of theovervoltage generated during the in and out state of the parallel capacitor branch on electrical equipment and a power grid.