The invention relates to a plaster for treating wounds and relieving pain, which belongs to the technical field of medicines. The invention includes a core-coated backing layer, a magnetic glue layer, a heating layer, a silicone gel layer, a medicine glue layer and a release paper arranged in sequence from bottom to top, and the magnetic glue layer is composed of nano-NdFeB magnetic powder, carboxymethyl shell Polysaccharide glue, polyvinyl alcohol glue, and glycerin are mixed and coated on the backing layer of the coating core and dried at low temperature; the heating layer is made of iron powder, activated carbon, sodium chloride, super absorbent resin, sodium polyacrylate glue, Polyvinyl alcohol mucilage and polystyrene particles are mixed and pressed on the magnetic glue layer; the silicone gel layer is made of medical silicone gel dressing film; the medicine glue layer is made of Chinese medicine extract, glycerin, carboxymethyl chitosan The glue and polyvinyl alcohol glue are mixed and coated on the release paper, dried at low temperature and pasted with the silicone gel layer. The invention organically combines traditional thermotherapy, magnetic field therapy and traditional Chinese medicine cataplasm, and promotes transdermal absorption of medicine through magnetothermal synergism, and the magnetic and thermal effects are controllable, continuous and stable.