The invention discloses a piezoelectric geophone comprising a housing and a simply supported beam substrate made of an elastomeric material; two ends of the simply supported beam substrate in the length direction are respectively rigidly connected on the housing and horizontally arranged; a piezoelectric strip is arranged on at least one end (of the top and bottom ends) of the simply supported beam substrate in the length direction; the piezoelectric strips are respectively axisymmetrically arranged in the half-length position of the simply supported beam substrate; each piezoelectric strip isconnected with an output wire so as to output signals of the piezoelectric geophone. The piezoelectric geophone is high in sensitivity, strong in anti-interference capability, wide in a dynamic scope, light and durable, and can be reliably and widely applied in the overland earthquake exploration and underground seam seismic exploration fields; compared with a cantilever structure fixed in a single end, the two ends of the simply supported beam substrate can be fixed, thus widening the detection frequency range under the beam substrate of the same length. A differential type structure is employed, thus providing stronger anti-interference capability when compared with a non-differential type structure.