As one of the smart actuator materials， shape memory alloy （SMA） has been widely developed and used with the characteristics of large deformation， large freedom of deformation direction， and the fact that the deformation can occur dramatically in a short period of time. The current application of SMA mainly focuses on its shape memory properties and pseudo-elastic properties， and both are directly related to temperature， but the low response frequency limits its application range. Based on this， lead barium zirconate （Pb_0.8Ba_0.2ZrO₃， PBZ） nanoceramic fibres are introduced into polyvinylidene fluoride （PVDF）， which are coated on the surface of NiTi sheet to prepare PBZ/PVDF@SMA sheet composite bending actuators by solution casting method. At room temperature， heating and cooling of SMA sheet bending actuators by the electrocaloric effect of PBZ/PVDF films， and comparing it with conventional methods of current heating and natural cooling SMA， aims to shorten the cycle time of the SMA sheet actuator and obtain a higher dis-placement output at the same time. The process of heating and cooling SMA sheet bending actuator with PBZ/PVDF composite film is simulated by simulation software.