A touch electrode, a touch display panel, and a touch display device are provided in embodiments of the present disclosure. The touch electrode includes a plurality of touch electrode groups, the plurality of touch electrode groups is arranged to extend linearly along a same extending direction and parallel to one another in a direction orthogonal to the extending direction, each touch electrode group includes a plurality of touch sub-electrodes arranged in series along the extending direction; each touch sub-electrode has a plurality of first conductive wires located therein, and a plurality of second conductive wires extending outward from an edge thereof, and respective second conductive wires of the plurality of touch sub-electrodes in each touch electrode group are at least partially connected with one another.