Abstract: A durable pivotal connecting device for a table lamp between a base and a supporting post of the lamp having a lampshade and a lamp pipe, the supporting post is connected to a rotation seat located in the base and is pivotably assembled with the durable pivotal connecting device for rotation adjustment of the supporting post; the connecting device includes two sets of curved spring leaves, two connecting rods, a transverse bar and an adjusting bolt. The spring leaves are arciform and symmetrically arranged, and each includes a connecting end and is split to form a slit, a positioning end and an adjustment end; screws are used to lock the connecting ends and the positioning ends of the spring leaves onto the inner wall of the base to pivotably mount the rotation seat; the adjustment ends are connected to the connecting rods and the transverse bar to make association of the two sets of spring leaves.