The embodiment of the invention discloses a manufacture method of an ultrathin single-fiber polyamide drawn textured yarn (6DTY), which comprises the following steps of: a, melting for high-speed spinning; b, laterally blowing air for cooling; c, oiling and bundling; d, winding; e, heating a conducting wire; f, cooling and false-twisting; and g, drafting to obtain the ultrathin single-fiber polyamide drawn textured yarn (6DTY) with yarn density of 0.40-0.55dtex. According to the invention, the method for manufacturing the ultrathin single-fiber polyamide drawn textured yarn (6DTY) by adopting a direct spinning method is formed through regulation and improvement of parameters such as a spinning assembly, spinning temperature, spinning speed, oiling, heat box temperature, D/Y ration, false twisting disk material and combination, roller speed ratio and the like, and thus the problem of end breaking, broken filaments and the like are solved, the production quality of the ultrathin single-fiber polyamide drawn textured yarn (6DTY) is stable, and the yield of the ultrathin single-fiber polyamide drawn textured yarn (6DTY) is increased.