The invention discloses an MVR (mechanical vapor recompression) evaporation crystallization system and method for high-salinity wastewater[0]. The system comprises a raw material tank, a first preheater, a second preheater, an MVR evaporator, a gas-liquid separator, a compressor, a first circulating pump, a condensate tank, a forced circulation evaporator, a second circulating pump, a crystallizer, a centrifuge and a vapor generator. The full utilization of secondary vapor is realized after high-salinity wastewater is treated with the system, and the system has the advantages that the cost is low, the continuity and the energy saving effect are good, and the crystal salt quality is high.