The present invention relates to an elevation adjustment structure for household upright lamp arm, and the structure has a cage ring with high-resilience fence ring body, and the cage ring has an open ring with axial notch, and the ring body is mounted near the end of inner rod of lamp arm, and the end of ring body with setting pieces is mounted on the end of inner rod; an end plug is screwed in the end of inner rod with cage ring by means of its thread plug; power cord is inserted through the outlet port near the base of outer rod of lamp arm and extending into the inner rod by means of axial hole of end plug, and an open end of inner rod is connected to the lamp; a screw is rotated into the thread hole on the flange of end plug for retaining the power cord in position; the end of inner rod with end plug is mounted in the outer rod and the distal end of outer rod is screwed with a screw cover; with such assembly the resilience of cage ring may enable the inner rod to move up and down for random positioning to achieve the purpose of easy adjustment of lamp arm elevation.