Method for recovering toluene diamine from high boiling tar residue discharged from toluene diisocyanate preparation process

Disclosed is a method for recovering toluene diamine from a fluid, high-boiling tar residue discharged from TDI preparation processes. After free TDI is separated and recovered from the tar residue, the remaining solid residue is pulverized, slurried and hydrolysis-treated in the presence of a catalyst under the condition of the liquid phase region near a critical point of water to produce toluene diamine, and then the resulting toluene diamine is effectively recovered.