The unfavorable external environment factors such as load, temperature will affect the signal receiving and sending of piezoelectric smart sensors. A piezoelectric smart aggregate sensor (about 8~15 cm3) is designed in this paper. The mechanical properties of piezoelectric smart aggregate sensors such as SAB and SAS resisting to compression failure are theoretically analyzed and experimentally studied. The signal singularity, that is, the acoustic emission signal of passive monitoring is recorded and analyzed. The results show that the stress range of 0.24~0.41 MPa is used as danger zone and 0.41~0.61 MPa as limit zone of the normal work of piezoelectric smart aggregate sensors. The 80% of actual compressive bearing capacity for piezoelectric smart aggregate sensors is nearly equivalent to achieve 90% of C30 concrete standard compressive strength, which fully illustrate the SAS piezoelectric smart aggregate sensor has the very good compressive performance, which reveals the excellent service performance of piezoelectric smart aggregate sensors under the actual engineering conditions.