Filter element and end cover assembling method and assembling jig

The invention relates to the field of filter screen manufacturing, and discloses a filter element and end cover assembling method and an assembling jig, and the filter element and end cover assembling method comprises the following steps: arranging an annular positioning groove with variable inner diameter and outer diameter on the jig, and extending a guide inclined surface from the outer diameter edge of the annular positioning groove; during assembly, the inner diameter of the annular positioning groove is smaller than the size of an inner ring of the cover, the outer diameter of the annular positioning groove is larger than the size of an outer ring of the cover, then the end cover is placed in the annular positioning groove, the inner diameter of the annular positioning groove is larger than the size of the inner ring of the cover, and the outer diameter of the annular positioning groove is smaller than the size of the outer ring of the cover. Then, the end part of the filter element is pressed along the