The torsional guided wave T(0,1) is an attractive mode to use for underwater pipeline inspection because this mode is not sensitive to liquid loading. A novel piezoelectric transducer array for the detection of corrosion in underwater pipelines using T(0,1) mode is developed and a series of tests are carried out in the laboratory environment. The transducer employs thickness shear mode piezoelectric ceramic as the sensitive element. The holding device is modular in design, and the modules are connected with other by a pin. This design method makes the transducer array has a certain flexibility, and the modules can be easily disassembled to satisfy the number of transducers for various diameter pipelines. The results show that the transducer array can efficiently excite and receive the T(0,1) mode in underwater pipeline. The echo signal from artificial notch correlated well with the notch size and location. The transducer system has the advantages of simple installation and flexible use, and provides an effective means for the underwater pipeline inspection using guided waves.