Plate heat exchanger, heat management system and vehicle

The invention discloses a plate heat exchanger, a heat management system and a vehicle, a heat exchange plate main body comprises a heat exchange plate main body, and a first heat exchange channel, a second heat exchange channel, a third heat exchange channel and a fourth heat exchange channel which are not communicated with one another are defined in the heat exchange plate main body; the first inlet and the first outlet are communicated with the first heat exchange channel, the second inlet and the second outlet are communicated with the second heat exchange channel, the third inlet and the third outlet are communicated with the third heat exchange channel, and the fourth inlet and the fourth outlet are communicated with the fourth heat exchange channel. According to the plate heat exchanger, four heat exchange media exist in the plate heat exchanger at the same time, heat exchange of any two heat exchange media, any three heat exchange media or four heat exchange media is achieved, and therefore different heat exchange modes of the plate heat exchanger are achieved, the cost is reduced, and the installation space is saved. Meanwhile, the four heat exchange media are not mixed, and the heat exchange efficiency of the plate heat exchanger is guaranteed.