The invention relates to a touch device, which comprises a substrate, a first lead, a second lead and a blocking structure, and is characterized in that the blocking structure can block metal materials in the first lead and the second lead from migrating; and a barrier material layer is configured to extend from one side, pointing to the second lead, of the first lead to one side, deviating from the substrate, of the first lead, and/or extend from one side, pointing to the first lead, of the second lead to one side, deviating from the substrate, of the second lead, so as to form the barrier structure by means of the barrier material layer. By setting the barrier structure formed by the barrier material layer between the leads having potential difference, the touch device can increase the difficulty of migrating metal ions to the low-potential lead side or prevent the metal ions from being separated out from high-potential leads, thus further improving or avoiding solving the problem ofshort circuit between the leads with potential difference in a high-temperature and high-humidity environment. The invention further provides a touch display panel and a display device.