PURPOSE: A deslopping agent of a converter containing waste asbestos and a manufacturing method thereof are provided to effectively treat the waste asbestos containing carcinogen without installing additional facilities. CONSTITUTION: A deslopping agent of a converter containing waste asbestos is composed of 10-20 wt.% of the waste asbestos, 60-70 wt.% of waste pulp, 10-20 wt.% of converter slag, and 5-15 wt.% of a binder. A manufacturing method of the deslopping agent of the converter is as follows: a step of mixing raw materials; a step of obtaining a molded object by press-molding the mixed raw materials; and a step of drying the molded object.