The invention relates to an assembled arch body of a heat recovery coke furnace. The arch body comprises a center inserting section, rectangular sleeves sleeve the two ends of the center inserting section, a center supporter installed on the center inserting section, oblique supporters, upper chords, arc plates and body strips; the center inserting section and the rectangular sleeves at the two ends form a telescopic lower chord beam, and the center supporter is a telescopic structure; the oblique supporters are symmetrically installed on the two sides of the center supporter and are telescopic structures, the lower ends of the oblique supporters are installed on the rectangular sleeves, the sides of the upper ends of the oblique supporters are connected with the upper end of the center supporter, and the other sides of the upper ends of the oblique supporters are connected with the end portions of the rectangular sleeves through the upper chords; the arch plates are installed on uppersurface plates of the upper chords to form arch body pieces, and the arch body pieces are connected through the body strips. The spans and arch heights of the arch body pieces of the assembled arch body are adjustable, the using amount of woods of upper chord arc plates is little, a large number of conventional revolving materials can be used, according to the construction method, installing anddismantling of arch bodies are convenient, and the mechanical team is not needed.