There is provided a method for preparation of a transition metal electroplated porous carbon nanofiber composite for hydrogen storage. Specifically, the preparation method of a transition metal electroplated porous carbon nanofiber composite for hydrogen storage according to the present invention comprises electroplating a transition metal with a controlled particle diameter and a surface dispersion ratio on a porous carbon nanofiber with specific surface area from 500 to 3000 m2/g, pore volume from 0.1 to 2.0 cc/g and diameter from 10 to 500 nm. With increased hydrogen storage capacity, the transition metal electroplated porous carbon nanofiber composite provided by the present invention can be utilized as hydrogen storage medium of active material for electrodes of electrochemical devices, such as fuel cell, secondary cell and supercapcitor.