A fabrication method of a nanometer transition metal-nanometer lithium oxide-porous carbon composite material comprises the following steps of uniformly mixing metal lithium powder, a nanometer metaloxide and a porous carbon material to obtain a mixture; slowly heating the mixture and performing heat preservation in inert atmosphere; and cooling to a room temperature to obtain the nanometer transition metal-nanometer lithium oxide-porous carbon composite material. The invention also provides a fabrication method of a lithium ion capacitor. The nanometer transition metal-nanometer lithium oxide-porous carbon composite material is not severe on environmental requirement, can be used for coating with a positive electrode and is simple to operate, a negative electrode plate is controllable inpre-lithiation degree and obvious in effect, the nanometer transition metal-nanometer lithium oxide-porous carbon composite material can be achieved under an existing lithium battery manufacturing condition, and the production cost can be greatly reduced.