The invention relates to a recovery method of tin in tin-stripping waste liquid. The invention includes the following steps: (1) using sodium carbonate solution to neutralize the pH value of the tin-stripping waste liquid to 3.5 to 9.0, filtering; (2) taking the filter cake obtained in step 1, adding water and sodium hydroxide, heating for boiling conversion 1 to 2 hours, wherein, the boiling temperature is 103 DEG C to 115 DEG C, adding water for stirring 30-60 minutes and then filtering, wherein, the dosage of the sodium hydrate makes the molar ratio of the tin and sodium hydrate to be 1:4-1:9 ; (3) fetching the filtrate obtained in step 2, stirring and infusing carbon dioxide in the filtrate until the complete deposition of tin, and then filtering, washing, drying the filter cake to obtain the metastannic acid. The invention has lower requirement for production equipment, friendly environment, and lower production costs; the produced metastannic acid and stannic oxide can satisfy various manufacturing production requirements; the entire production process can achieve the recycling use of materials, zero discharge, good economic, environmental and social benefits.