Negative pole piece, secondary battery, electric device, and preparation method and application of negative pole slurry

The invention provides a negative pole piece. A negative active material layer of the negative pole piece comprises a polymer binder; the polymer binder comprises a plurality of polyolefin main chains and a plurality of bridging groups which are in network connection, polar groups are arranged on side groups and the bridging groups of the polyolefin main chains, hydrogen bonds can be formed among the polar groups, and the side groups of the polyolefin main chains at least comprise-OH and further comprise at least one of-COO-and-COOH.