The invention discloses an electricity leakage protection plug and an electric water heater. The electricity leakage protection plug includes a three-pole jack connected with an external power socketin a plugging manner; a three-pole linkage switch connected with the three-pole jack so as to connect and disconnect a zero line, a live line and a ground line connected to a power source; a first detection unit arranged corresponding to the zero line and the live line and judging whether the zero line or the live line meets electricity leakage or not through detecting electricity leakage signalsof the zero line or the live lien; a tripping circuit generating a first tripping command when the zero line or the live line meets electricity leakage; a tripping mechanism connected with the tripping circuit and the three-pole linkage switch separately and performing control over the three-pole linkage switch after receiving the first tripping command so as to enable all of the zero line, the live line and the ground line to be in a disconnection state. Therefore, electricity utilization safety can be ensured effectively.