The present application relates to a piezoelectric acceleration sensor, comprising a base member that comprises a supporting part provided with a mounting hole extending along an axis thereof and a columnar connection part located on the connection part; a piezoelectric member, sleeved outside the connection part, and defining with the connection part an annular clearance therebetween; a mass block member, sleeved outside the piezoelectric member in a gapless manner; a pre-tightening member, being a wedge block with a thinner end near the supporting part and inserted into the annular clearance; a locking member that comprises an interconnected columnar part and stopping part; wherein, the columnar part is fitted with the mounting hole for locking the above members, and the stopping part is arranged to press the first end; the columnar part and the mounting hole are provided with fastening glue arranged between.