Multi-layered piezoelectric structures have special applications for vibration control, and they often serve in a thermoelastic coupling environment in many cases. In this work, the fractional order generalized thermoelasticity theory is used to investigate the dynamic thermal and elastic behavior of a bi-layer piezoelectric-thermoelastic plate with temperature-dependent properties. The thermal contact resistance is implemented to describe the interfacial thermal wave propagation. The governing equations for the bi-layer piezoelectric-thermoelastic plate with temperature-dependent properties is formulated and then solved by means of Laplace transformation and Riemann-sum approximation. The distributions of the considered non-dimensional displacement, temperature and stress are obtained and illustrated graphically. According to the numerical results, the effects of the thermal contact resistance, the ratio of material properties between different layers, temperature-dependent properties and the fractional order parameters on the distributions of the considered quantities are revealed in different cases and some remarkable conclusions are obtained. The investigation helps to gain insights in the optimal design of actuators, sensors made of piezoelectric materials.