The invention discloses a
piezoelectric sensor, which comprises a piezoelectric
assembly and a fixing
steel frame for fixing the piezoelectric
assembly, wherein the piezoelectric
assembly comprises aplurality of piezoelectric rulers and two steel rails, the two steel rails are oppositely arranged, the piezoelectric rulers are fixed between the two steel rails respectively, the steel rails and thepiezoelectric rulers are combined to form a ladder shape, the outer ends of the steel rails are wrapped with
abrasive paper, the upper ends and the lower ends of the steel rails are fixed to the corresponding fixing steel frames respectively, and the piezoelectric assembly is connected with an
electric energy storage box and a side slope early warning
monitoring system through conducting wires respectively. According to the invention, the
pressure sensor is high in precision and high in practicability, the piezoelectric ruler generates
electric energy through bending deformation, the electricenergy is provided for a slope early warning
monitoring system, self power supply is achieved, and cost is saved.