The present invention relates to a double pipe fixing device for fixing a heating pipe connected to a heating distributor and a water supply / hot water pipe in a slab to be fixed at an accurate position. According to an embodiment of the present invention, there is provided a dual pipe fixing device comprising: a fixing member to which a double pipe is inserted and fixed; And a pair of support members located on both sides of the fixation member and supporting the fixation member, wherein the fixation member comprises: a plate having a plate shape; Two or more coupling holes into which the double tube is inserted; And a through hole located on both sides of the plate, wherein the support member comprises: a pair of bolts inserted into the through hole; A pair of pressing and securing parts fastened to the bolts and pressing and fixing the fixing parts downward; And a pair of first protective pipes which are fastened to the bolts and support the fixing member from below and prevent exposure of the lower part of the bolts. Thus, the piping can be easily connected to the heating distributor, and the piping can be vertically connected to the heating distributor without deformation. In addition, since it can be reused in slabs, the construction cost can be lowered.
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