In order to study the characteristics of micro-seismic signals in the static cracking process of cement, the micro-seismic signals of the cement cylinder model in the static cracking processes were collected by a soundless cracking agent and ZDKT-1 type coal or rock dynamic disaster experimental simulation system. Hilbert-Huang transform (HHT) was used to analyze the microseism signals. The results show that: a. The process of static cracking could be divided into three stages: initial, middle and late. The amplitudes and energies of micro-seismic signals in the static cracking process did not change monotonically, but changed between weak and strong. b. The laws of micro-seismic signals in the static cracking process of different strength specimens were similar, but in high strength specimens, the micro-seismic signal arose later, lasted longer, and had higher amplitude and frequency. c. While the processes of static cracking were long, the microseism signals were paroxysmal and lasted under two seconds, with small amplitudes. The frequency distribution of the middle stage was wider than those of the initial and late stages, but their dominant frequencies were all lower than 50 Hz.