Absolute magnetostrictive displacement measurement magnetic box

The utility model discloses an absolute magnetostrictive displacement measurement magnetic box, a magnetic mark group included in the absolute magnetostrictive displacement measurement magnetic box is composed of two groups of magnetic marks, the magnetic marks are fixed on a magnetic mark mounting plate according to a coding rule, and the distance between the two groups of magnetic marks in each magnetic box in the same magnetic coding system is determined and unique; the position of the magnetic mark is fixed in the magnetic box shell, and the magnetic box can be fixed by matching the lateral grooves with the fixing clamping pieces. The magnetic box can be used in cooperation with a magnetostrictive displacement sensor for a long time after being installed at a time, and a single magnetic box can excite two sets of echo signals on the displacement sensor. Echo signals are received through the magnetostrictive displacement sensor, the induced magnetic box can be recognized and the absolute position of the ma