The utility model discloses a petroleum industrial wastewater recycling system comprising a pretreatment device, a multi-effect evaporation device, a crystallization device and a condensation device, wherein the pretreatment device comprises a multi-medium filter and a micro-filter; each evaporator is provided with an evaporator shell pass and an evaporator tube pass; the condensation device is provided with a condensation tube pass and a condensation shell pass; the condensation shell pass is provided with a condensation shell pass inlet end and a condensation shell pass outlet end; the condensation shell pass inlet end is communicated with a first condensation channel and a second condensation channel; the condensation shell pass outlet end is used for outputting fresh water; and a condensed fluid can be introduced in the condensation tube pass. The petroleum industrial wastewater recycling system disclosed by the utility model performs evaporation treatment on salt-containing wastewater in the petroleum industry by adopting the structure; and the crystallization device is used for crystallizing concentrated water to precipitate crystals. Meanwhile, the salt-containing wastewater is transformed into the fresh water, and wastewater can be recycled. The petroleum industrial wastewater recycling system also makes full use of the waste heat in the petroleum industry, so that the energy consumption in a petrochemical production process can be reduced.