The invention relates to the field of lithium ion batteries, in particular to a method for lithium supplement of a lithium ion battery negative electrode plate, a lithium-supplement negative electrodeplate and a lithium ion battery. The method for the lithium supplement of the lithium ion battery negative electrode plate comprises the step of drying the negative electrode plate and a lithium hydrogencarbonate solution after contact to obtain the lithium-supplement negative electrode plate. The invention also provides the lithium ion battery fabricated by the lithium-supplement negative electrode plate. The lithium ion battery is obtained by assembly and formation of the lithium-supplement negative electrode plate, a positive electrode plate, a separator and an electrolyte. According to the method for lithium supplement of the lithium ion battery negative electrode plate, the employed lithium hydrogencarbonate solution (lithium source) is not toxic, the problem of safety does not exist, the method can be performed without protection of inert gas, and industrial production is facilitated; and moreover, the lithium ion battery provided by the invention employs the negative electrodeplate subjected to lithium supplement (namely, the negative electrode plate comprising lithium carbonate on a surface) and a lithium carbonate-containing electrolyte, the negative electrode plate andthe electrolyte are jointly matched, and the initial coulombic efficiency and the cycle capacity retention rate of the battery are greatly improved.