Regeneration method of SCR (selective catalytic reduction) catalyst

The invention discloses a regeneration method of an SCR (selective catalytic reduction) catalyst. According to the method, the catalyst is cleaned through two steps and is loaded with active components after complete cleaning, blocking materials are more thoroughly cleaned, and the active components are more uniformly loaded. An adopted cleaning fluid formula belongs to a low-toxic or even non-toxic material, so that environmental pollution is reduced; a weak acidic or weak basic solution is adopted, and loss of the active components in the catalyst is avoided in a cleaning process, and the method further has the characteristics of high pertinence and high efficiency. The activity of the catalyst cleaned in a separated manner recovers to higher than 95% of the activity of a fresh catalyst.