The utility model relates to an electric power field specifically is an electric current cross can auto -power -off power filter, which comprises a housin, the casing includes interior casing and shell body, there is interior casing the inner chamber bottom of shell body through third support fixed mounting, the top surface both sides of interior casing are through the inside top surface fixed connection of first support with the shell body, the inside lateral wall fixed connection of second support and shell body is passed through on the lateral wall upper portion of interior casing, and this electric current cross can auto -power -off power filter protects power filter through the structure of adding inner/outer casing body disconnect -type, lowers the temperature to the device through the vent that both sides were offered, avoids the potential safety hazard that the high temperature takes place, protects the device through joining relay protection switch simultaneously, avoids the electric current too big, phenomenons such as the device damage that leads to the fact, short circuit.