The invention discloses a double-effect cross-flow MVR evaporation and concentration system including a feed liquid flow subsystem, a cross-flow steam compression subsystem and a waste heat recovery subsystem. In the feed liquid flow subsystem, feed liquid is preheated by the waste heat recovery subsystem, and performs primary evaporation after reaching a bubbling point through live steam heating; generated secondary steam is compressed by a primary compressor to serve as a heat source of secondary evaporation; primarily concentrated feed liquid is sent to a secondary evaporator via a primary discharge pump for continuous evaporation and concentration; generated secondary steam is compressed by a secondary compressor to serve as a heat source of primary evaporation, and completion liquid is discharged out of the system via a secondary discharge pump. The feeding speed, the preheating temperature, the circulatory flow and the compressor working pressure difference of the system are under accurate control of a PLC. Compared with a single-effect MVR evaporation and concentration system, the system has the advantages that the steam compressor operation pressure difference is reduced, power consumption is saved by 25%-40%, the evaporation and concentration expenses are reduced and emission of carbon dioxide causing the greenhouse effect is greatly reduced.