The invention discloses a water pipe wrapped with a high-density plastic layer. The water pipe comprises a water pipe body. The two ends of the water pipe body are arranged in a communicated mode. The outside of the water pipe body is wrapped with the high-density plastic layer internally provided with multiple heating steam channels. A steam heating device is fixedly installed outside the water pipe body. One ends of the heating steam channels are communicated with the steam heating device, and multiple steam dispersing branch pipelines are arranged below the other ends of the heating steam channels. In this way, the water pipe can be protected in a wrapped mode, steam can also be conveyed to the water pipe to be heated, and therefore the situation that a water pipe bursts and is damaged as being frozen under low temperature in the cold winter is avoided.