The invention relates to a spraying method and device for separating copper from tin in a tin-plated copper block. The method comprises the following steps of: pushing a special copper and tin separation spraying device, into which a movable baffle plate is inserted, into a loading area according to a design requirement and loading the tin-plated copper block into the special copper and tin separation spraying device; pushing the special copper and tin separation spraying device loading with the tin-plated copper block into a tin removing area and spraying an immersion liquid to remove tin; pushing the special copper and tin separation spraying device into a rinsing area after tin removal and spraying a rinsing liquid for rinsing; pushing the rinsed special copper and tin separation spraying device into a water washing area after rinsing, spraying water for water washing to obtain a tin-removed copper block, pushing the water-washed special copper and tin separation spraying device into an unloading area and extracting the movable baffle plate for unloading; and pushing the special copper and tin separation spraying device into the loading area after unloading. Meanwhile, the invention discloses a device special for the method. The method and device have the characteristics of short process flow, simple equipment, quickness in loading and unloading and high leaching rate.