Provided are a binder and a preparation method thereof, a battery, and a power-consuming device. The binder includes an acrylate polymer, a number-average molecular weight of the acrylate polymer is 10 kDa to 3000 kDa, a molecular structure of the acrylate polymer contains side-chain groups, and the side-chain groups include a fluorine-containing chain segment, a cyano chain segment, and a crosslinkable chain segment, wherein a fluorine element accounts for 3% to 30% by mass in the molecular structure, and a cyano group accounts for 10% to 40% by mass in the molecular structure.