The invention discloses a dual-arm piezoelectric geophone core and a dual-arm piezoelectric geophone. The dual-arm piezoelectric geophone core comprises a first end piezoelectric plate, a second end piezoelectric plate, a third end piezoelectric plate, a fourth end piezoelectric plate, a first cantilever beam base and a second cantilever beam base. The first cantilever beam base and the second cantilever beam base are made of elastic materials. The end piezoelectric plates are located at two ends of the two cantilever beam bases respectively. One end of each cantilever beam base is rigidly connected with a fixing support. The fixing supports are used for being connected with a shell of a piezoelectric geophone rigidly, and are in a vertical state after connection. The end piezoelectric plates are connected with output guide lines electrically. The dual-arm piezoelectric geophone based on the dual-arm piezoelectric geophone core has the advantages of high flexibility, high anti-jammingcapability, wide dynamic range, portability, durability and the like, is reliable and extensive in application to the fields such as ashore seismic exploration and downhole slot-wave seismic exploration, and has wider detection frequency range than single-arm piezoelectric geophones under the condition of same core occupation space.