Negative pole piece and preparation method thereof, electrochemical device and electronic device

The invention relates to a negative pole piece and a preparation method thereof, an electrochemical device and an electric device. The negative pole piece comprises a negative current collector and a negative active material layer. The negative electrode active material layer comprises a first active material layer and a second active material layer, the first active material layer is arranged on the surface of the negative electrode current collector, and the first active material layer comprises a plurality of first through holes which penetrate through the first active material layer along the thickness direction of the negative electrode current collector and are arranged at intervals; the second active material layer is at least arranged on the surface of the negative current collector, and the first active material layer is arranged between the second active material layer and the negative current collector. Wherein the first active material layer comprises silicon-based particles; the second active mat