An auxiliary bamboo thermal bending device. One end of bamboo (14) which is thermally bent in advance is fixed by means of a first fixing assembly, and the other end of the bamboo (14) which is thermally bent in advance is fixed by means of a second fixing assembly, wherein the second fixing assembly and the first fixing assembly are positioned in the same vertical direction; then, the bamboo (14) fixed between the first fixing assembly and the second fixing assembly is heated while the second fixing assembly is controlled by a control assembly to move downwardly in a first guide rail (25)to apply a force to the bamboo (14), so that the bamboo (14) is bent in a vertical plane. The technical problem in the current bamboo bending method of bending point offset or inconsistent curvatures of bamboo as it is difficult to control the bending point when the bamboo is mainly bent manually, as well as the technical problem of low production efficiency, are solved.