The present disclosure provides a touch substrate and a touch display panel. The touch substrate includes: a base substrate including a first and second surfaces opposite to each other; a first metal mesh layer disposed on the first surface of the base substrate, the first metal mesh layer including a plurality of first metal mesh strips arranged successively along a first direction, every two adjacent first metal mesh strips being independent from each other, each first metal mesh strip extending along a second direction orthogonal to the first direction and including metal mesh lines, the metal mesh lines including a plurality of trunk portions extending along the second direction and a plurality of branch portions respectively connected to the plurality of trunk portions, extending from the plurality of trunk portions along a direction at a predetermined angle to the second direction.