Foot support structure of office chair

The utility model provides a foot support structure of an office chair. The foot support structure comprises a foot support and telescopic rods which are symmetrically arranged, the telescopic rods on the two sides are connected through a fixing rod. A rotary limiting piece of a cylindrical structure is fixedly arranged on the fixing rod, and an upper clamping groove and a lower clamping groove opposite to the upper clamping groove in direction are formed in the rotary limiting piece; a rotating structure is arranged at the bottom of the foot support; the fixed rod is fixed in the rotating structure; a foot support card capable of moving up and down through a spring and a foot support switch is arranged in the rotating structure; the foot support has an unfolding state that the top end of the foot support clamping piece is partially clamped into the upper clamping groove of the rotating limiting piece and a turning-down state that the foot support clamping piece is clamped into the lower clamping groove of th