Catalyst regeneration method for improving selectivity of catalyst

The invention relates to a catalyst regeneration method for improving the selectivity of a catalyst. A catalyst to be regenerated is contacted with oxygen-containing gas in a dense-phase fluidized bed regenerator, is regenerated under the conditions that the temperature is 550 to 750 DEG C and the mean detention time of the catalyst is 4 to 30 minutes, and generates a coke combustion reaction, the regenerated catalyst enters a reactor, and flue gas enters an energy recovery system of the flue gas by a cyclone separator. The distribution of the activity of the regenerated catalyst obtained by the method is more uniform, the activity of the regenerated catalyst obtained by the method more approaches to the equilibrium activity of a catalyst, part of heavy metal on the surface of the regenerated catalyst is buried by a substrate under the conditions of low temperature and long-time operation, and the rest part of the heavy metal is passivated. When hydrocarbon carries out a catalytic cracking reaction on the regenerated catalyst, the yields of dry gas and coke are obviously lowered.