In this paper, multifunctional nanotubes were prepared by directly combing iron oxide (Fe3O4) nanoparticle (NPs) decorated carbon nanotubes (CNTs), and palladium (Pd) NPs together with polypyrrole (PPy) in a facile way. Firstly, magnetic CNT composite (CNTs/Fe3O4) was synthesized by the high temperature decomposition process, then PPy could be easily immobilized on the magnetic CNTs. Furthermore, Pd NPs were accumulated on the surface of CNTs/Fe3O4@PPy to obtain one dimensional CNTs/Fe3O4@PPy/Pd composite. The composite extraordinary amplified the electrochemical response, providing a highly sensitive electrochemical platform for triclosan detection. This electrochemical sensors had the advantage of fast response, cheap instrument, low cost, simple operation, high sensitivity and real-time detection in situ condition. Moreover, the sensor exhibited a wide linear response range for triclosan (2.247 x 10(-9) M to 2.752 x 10(-7) M) with a detection limit of 1.417 x 10(-9) M, respectively. In addition, the electrochemical sensor reported herein was applied for the detection of triclosan in real samples, revealing promising applications in developing the sensor for environmental inspection and monitoring.