The invention discloses a plant bionic solar distiller, which belongs to the technical field of solar heat utilization and water treatment. The device mainly includes bionic hydrophilic roots, bionic stems, bionic petioles, bionic veins, and bionic leaves. The bionic leaf refers to the physiological structure of green plant leaves, and its internal structure includes a light-transmitting plate, a heat-insulating grid, a heat-absorbing plate, a hydrophilic fiber film, a bionic vein, a distillation film, a condensation interlayer, and a condensation plate. During the desalination process, sunlight passes through the light-transmitting plate, is absorbed by the heat-absorbing plate and is converted into heat energy and heats the seawater in the hydrophilic fiber membrane. The evaporated water vapor passes through the distillation membrane and is condensed into fresh water by the condensation plate below. This process refers to Transpiration of green plants. At the same time, the device uses the water potential difference and the capillary force of the hydrophilic material to simulate the water spit phenomenon of plants and avoid the accumulation of salt on the evaporation surface. The inventive device has the characteristics of compact structure, easy operation and sustainable operation.