The invention discloses a preparation method and application of a lead-free piezoelectric ceramic material. The method comprises the following steps: ball-milling and pre-sintering alumina, diboron trioxide, barium titanate, potassium carbonate and cobalt oxide; ball-milling the pre-sintered materials into powder again, and then adding polyethylene glycol, ethyl orthosilicate, sodium zirconium silicate and phosphatidylserine for thermal reaction; cooling, ageing and drying to obtain a slurry; placing the slurry in an inert gas atmosphere; adding absolute ethanol and toner for heat preservationand plastic removal to obtain a plastic-removed blank; and finally, adding a binder into the plastic-removed blank for compression molding, sintering and cooling to obtain a finished product of the lead-free piezoelectric ceramic material. The prepared lead-free piezoelectric ceramic material has good mechanical properties and high mechanical quality, and has good application prospects in manufacture of electronic components.