The invention discloses a plate electrode power distribution network decoupling design method based on maximum time domain transient noise. The plate electrode power distribution network decoupling design method based on maximum time domain transient noise is used for solving the technical problems of over-design existing in existing frequency domain PDN (power distribution network) decoupling design and poor operability existing in time domain PDN decoupling design. The method is implemented through the steps of 1, computing the time domain target resistance of a plate electrode power distribution network; 2, computing the time domain decoupling time range and the time domain decoupling time point of the plate electrode power distribution network; 3, computing the time domain transient state resistance of a voltage stabilizer model in the time domain decoupling time range of the plate electrode power distribution network; 4, selecting the time domain decoupling time points of a plate electrode power distribution network to be decoupled; 5, selecting a plate electrode power distribution network decoupling capacitor. The plate electrode power distribution network decoupling design method based on maximum time domain transient noise can simplify decoupling networks and improve the operability and can be applied to power noise suppression in high-speed circuit board design.