The utility model provides a waterproof tree medium voltage cable, including the cable core of being no less than one insulation core constitution, insulation core from interior to exterior includes conductor, conductor shield, insulating layer and insulation screen in proper order, the conductor sticiss the copper conductor for adding the whitewashed stranded that blocks water, does conductor shield and insulation screen's material is contain 30% ethylene ethyl acrylate's polyethylene semiconductive shieldin material, the material of insulating layer is for adding 1% imvite crosslinked polyethylene, the cable core outward in proper order the cladding have water blocking layer and oversheath, be the filling layer between insulation core and the cable core. The utility model discloses waterproof tree cable is applicable to long -term humidity, and in the rainy environment, the invasion that can effectually slow down moisture content restraines the formation of water branch, increases the cable life -span, it is with low costs, preparation simple process, light in weight, easily laying installation has extensive range of application.