This invention discloses a double-channel electromagnetic method for separating zinc residue from hot-plating zinc solution. The method comprises: sucking out zinc solution from a kettle with a pump that can continuously run, introducing into a double-channel electromagnetic purification flow groove outside the kettle, performing primary filtration with a foamed ceramic filter, introducing into an electromagnetic purification apparatus, performing secondary filtration via applying an alternate magnetic field, and returning into the kettle via a pipeline. Both the primary and the secondary filtration processes are performed in the double-channel electromagnetic purification flow groove, in which there are an electromagnetic valve, a primary filter and a secondary filtration electromagnetic purification apparatus inside either channel. During the purification process, more and more zinc residues are attached to the ceramic tube wall, so the ceramic tube should be replaced when accumulated zinc residues reach a certain quantity. The ceramic tube is replaced by: tswitching off the electromagnetic valve at the front end of one channel to cut off the communication of the zinc solution, and meanwhile switching on the electromagnetic valve at the front end of the other channel. The method can continuously purify for 6 h, reduce the content of zinc residues suspending in the zinc solution by more than 90%, and decrease zinc consumption by 12%.