The invention discloses a lithium battery current collector and a preparation method thereof, the lithium battery current collector comprises a porous metal foil and a material layer having an electrical resistance positive temperature effect and covering the upper and lower surfaces of the porous metal foil, the porous metal foil is an aluminum foil, a copper foil, a carbon coated aluminum foil or a carbon coated copper foil, wherein the material layer having the electrical resistance positive temperature effect comprises at least one polymer material and at least one conductive material, andthe material layer having the electrical resistance positive temperature effect and covering the upper and lower surfaces of the porous metal foil is partly embedded in the pores of the porous metalfoil. The lithium battery current collector has the characteristics of excellent internal interface bonding property, and low contact resistance and high bonding strength with lithium battery positiveand negative electrode materials, can effectively improve the cycle performance of a lithium battery, can also actively perform the thermal management on the lithium battery, effectively prevents thelithium battery from being out of control, thereby improving the safety performance of the lithium battery.