Abstract: The silica-calcium composite sol was prepared by sol-gel method, and silica-calcium composite film was prepared on the surface of piezoelectric ceramics to improve the interface of cement-based piezoelectric ceramic composites. The sol ratio was determined, and the effects of aging, low temperature heat treatment and silane coupling agent on the contact angle, piezoelectricity and dielectric properties of piezoelectric ceramics with silica-calcium composite film were investigated. The results show that the molar ratio of Ca to Si greater than 0.2 in silica-calcium composite sol is not conducive to film formation; increasing the aging temperature and prolong the aging time can significantly reduce the contact angle; the optimal number of layers of silica-calcium composite film is 3, and sintering temperature is not more than 160℃; the addition of a trace amount of a silane coupling agent can effectively improve the cracking of the film layer. The prepared silica-calcium film has a minimum contact angle of 27° and good hydrophilicity.