The present invention relates to a portable composite roaster that is small in size, enables a user to selectively use gas, charcoal or the like as a heating means, and is simple and convenient to use for anyone. The roaster has primary, secondary and tertiary heat-isolating screens arranged outside the heating means to effectively isolate heat and to protect a table on which the portable composite roaster is placed or users from heat generated by the heating means such that the users may use the roaster in accordance with the needs thereof. The portable composite roaster of the present invention enables users preferring charcoal-cooked food to roast food using charcoal, and enables users inconvenienced by charcoal to easily use gas instead of charcoal and enjoy delicious food.