The invention discloses a dry-wet combined sorting system for municipal solid waste. The system comprises a dry type crushing air separation device and a wet type water sorting device. The system is compact in structure; crushing cutters with different rotary speeds and the same rotating direction are adopted so that the problems that the crushing cutters are easy to wind, block and the like when the waste is crushed are solved; the system can produce continuously, is high in production efficiency and easy to operate; meanwhile, a multi-protection device is arranged so that the whole set of system is safe and reliable; corrodible organic matters, light combustible matters and inorganic matters can be separated completely; the light combustible matters are sorted by the dry type crushing air separation device, have the low water content and are convenient for subsequent energy-oriented utilization, so that the municipal solid waste is used as a source and is utilized sufficiently; the waste is changed into valuable things; the dry-wet combined sorting system has very high environmental benefits and social benefits.