The invention discloses a regeneration method for a waste mercuric 
chloride contact agent and belongs to a recycling technique of the waste mercuric 
chloride contact agent. The regeneration method comprises the following steps: firstly, performing wet-process leaching on the waste mercuric 
chloride contact agent, performing leaching reaction under an ultrasonic effect, and filtering, thereby acquiring a mercury-containing filtrate; controlling temperature, adding a neutralizer for regulating pH value, completely converting mercury ions in the solution into mercuric 
oxide sediments, and keepingtoxic 
phosphor and 
sulfur in the mercury contact agent still in the solution; dissolving mercuric 
oxide with 
hydrochloric acid, thereby acquiring a mercuric chloride solution used for preparing the mercury contact agent; performing 
microwave high-temperature activating on filter residue (waste contact agent for mercury removal) under the condition of activating gas, thereby acquiring a regenerated 
activated carbon for waste mercury contact agent; soaking the 
activated carbon for waste mercury contact agent in a mercuric chloride solution for waste mercury contact agent, thereby acquiring a new mercuric chloride contact agent. According to the invention, efficient recycling of mercuric chloride and regeneration of 
activated carbon can be simultaneously realized in the manner of combining ultrasonic acidizing leaching with 
microwave high-temperature activating treatment.