An instant type electric water heater of improved power insulation walls comprises a surface cover, a bottom shell, an instant type electric water heating device, the power insulation walls, and a cold-water water inlet connector and a hot-water water outlet connector which are arranged on the bottom shell, wherein the power insulation walls are arranged between the cold-water water inlet connector and the instant type electric water heating device, and between the hot-water water outlet connector and the instant type electric water heating device; the instant type electric water heater is characterized in that each power insulation wall comprises a high-temperature-resisting bendable pipe body and high-temperature-resisting fiber cloth covering the pipe body. By the aid of the structure, the water flow length of the power insulation walls is increased so that water flow channels are increased when being compared with those of the power insulation walls in the prior art; the power insulation effect is improved and the safety performance is enhanced; the inner wall is smooth, the water flow resistance is small, the deposition can be prevented and the blocking is prevented.