The invention relates to preparation method and application of a copper carbon silicon composite negative electrode plate in the technical field of electrochemical energy sources. The preparation method comprises the steps of spinning a mixed solution of a copper nanowire and a carbon nanotube on a copper foil to prepare a porous current collector; and depositing a silicon thin film on a surface of the porous current collector by a PECVD method after drying to prepare the copper carbon silicon composite negative electrode plate. With the porous current collector formed by combination of the copper nanowire and the carbon nanotube, the silicon thin film is combined, the mobility of lithium ions in a negative electrode is improved, the huge stress generated by expansion of silicon is reduced, and the negative electrode plate has the characteristics of high energy density, good cycle property and the like.