The present invention relates to an apparatus which uses an induction coil for treating toxic waste gas. The apparatus for treating toxic gas of the present invention comprises: a first scrubber installed in a housing for thermally decomposing and performing the primary filtering of a waste gas entering through an intake port by using a method for induction heating in a heating chamber by means of an induction coil; a 2nd scrubber, which is a wet filtering chamber, for reacting the waste gas, which has been thermally decomposed and has undergone a primary filtering stage through the 1st scrubber, with water sprayed from a spray nozzle, and performing a secondary filtering of the waste gas; and a water tank installed between the outlet end of the 1st scrubber and the inlet end of the 2nd scrubber for precipitating and filtering by-products and residual gas from the waste gas which underwent primary filtering through the 1st scrubber. The 1st scrubber is configured to generate a vortex by means of an enlarged dividing portion formed in the center of the intake port during the inflow of gas into a heating chamber through the intake port, and to divide and supply the flow of gas along the inner wall of the sleeve of the heating chamber and into the heating chamber. Thus, according to the present invention, the sleeve of the heating chamber can be uniformly and directly heated by means of an induction coil; and the thermal decomposition of waste gas can be performed in order to make the control of the surface temperature and of the inner temperature of the sleeve very convenient due to the direct heating method of the sleeve by means of the induction coil. Also, temperature can be raised in a short period of time to the temperature desired by the user, high efficiency and low manufacturing cost can be attained by directly heating the heating chamber via the induction coil, the user can select a suitable frequency according to the material and size of the heating chamber and can arbitrarily control a uniform temperature, speed, etc., various forms of contamination can be prevented by having the sleeve of the heating chamber completely separated and sealed from the induction coil which is the heat source, a completely non-polluting heating system can be realized by not using a separate heater, gas, etc., the installation area can be minimized with respect to the output of the heating chamber, and other significant effects can be obtained.
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