The present application relates to a flexible piezoelectric
transducer and a
system, the flexible piezoelectric
transducer comprises: a flexible substrate which is circular in a first state and concave spherical in a second state, and which is capable of dynamically changing the
radius of curvature by bending deformation; a flexible piezoelectric film layer which is arranged on the flexible substrate, at least one spiral
electrode strip is arranged on the upper surface of the flexible piezoelectric film layer, the at least one spiral
electrode strip has the same original point, and a fully-coated
electrode is arranged on the lower surface of the flexible piezoelectric film layer. According to the flexible piezoelectric
transducer and the
system, the equipment integration degree is improved; by means of bending deformation of the flexible substrate and the flexible piezoelectric film layer, after phased excitation of acoustic
spiral wave beams, the depth of a focal spot can be dynamically changed, the
directivity of an emission
array element is widened, energy superposition in a focusing area is enhanced, focusing acoustic vortex change is stable, and a long distance can be maintained in the propagation direction.