An apparatus of adjusting a height of a roller of a heating furnace is provided to effectively convey products by forming a body, which includes crisscrossed frames and has rollers successively installed thereon, such that the roller is adjusted according to a horizontal adjustment device. An apparatus of adjusting a height of a roller of a heating furnace comprises a support(10) having a driving member, a base body(20), a height adjustment frame(30), a horizontal adjustment member(40) fixed to the support, a bolt(50) and a nut(51). The base body includes crisscrossed frames and is provided with a plurality of rollers(22). Two sides of the base body are supported by a first frame(21) of the crisscrossed frames. The height adjustment frame is fixed to two sides of the first frame, and has a lower part, on which a fixing hole(31) is formed, and an upper part having a support piece(32). The horizontal adjustment member has a projection surface which has an elongation hole(41). The projection surface is bent and has a coupling hole(42) coupled to the bolt. An end of the bolt is in contact with the support piece.
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