The invention discloses a feeding and blending technology and a feeding and blending device for cold recycling of an emulsified asphalt factory. The stepped feeding and stepped blending technology is adopted, i.e. the technology comprises the steps of accurately gauging and matching new aggregate, feeding into a one-step stirring pot through a belt conveyor system, spraying a small quantity of water at a new aggregate inlet, pre-stirring, spraying a small quantity of emulsified asphalt, sufficiently blending, enabling the surface of the new aggregate to be packed with a small quantity of asphalt, adding asphalt pavement milling old material, cement and mineral powder, spraying water again, spraying the emulsified asphalt after pre-stirring again, and sufficiently blending, so that an emulsified asphalt regenerated finished material with characteristics of the paved asphalt pavement lower layer can be prepared. After the finished product material prepared by the construction technology and device for feeding and blending in a stepped way is used, the use value of the asphalt pavement milling old material can be sufficiently played, and the produced finished product material is stable in quality; when the material is used for paving roads, the road quality can be improved, and the service life of the roads can be prolonged.