The invention discloses an acceleration sensor used for detecting earthquakes and rock noise and a manufacturing method thereof. The acceleration sensor comprises a plurality of sub structures in the form of an array, wherein each sub structure comprises a mass block, an anchoring point connected with the mass block in the transverse direction and comb teeth capable of generating relative displacement in the transverse direction; and the plurality of sub structures are connected with each other through first supporting structures in the transverse direction and connected with each other through second supporting structures in the longitudinal direction vertical to the transverse direction. By using the acceleration sensor, the stress can be released through the first and the second supporting structures connected among the sub structures so that the sensitivity is improved.