The invention discloses preparation methods of mineralized hydrogel and a biomimetic mineralized bone 
repair material. The mineralized hydrogel is prepared by using a photoactivated biomacromoleculesand a photoactivated 
phosphatase as raw materials; hydrogel is formed by initiating cross-linking by means of 
light irradiation or initiating 
polymerization cross-linking by means of a 
radical initiator; when the hydrogel is put into mineralized liquid, 
phosphatase can promote the uniform deposition of 
phosphate in the gel, so that the uniformly mineralized hydrogel is obtained. 
Phosphoprotein-like molecules are added during the preparation of the hydrogel; the 
phosphoprotein-like molecules can promote the uniform deposition of 
phosphate along a 
molecular network of biomacromolecules, so thatthe high-strength mineralized hydrogel can be obtained. When the 
phosphoprotein-like molecules and cells are added during the preparation of the hydrogel, the in-situ loading of the cells can be realized, and the 
enzyme in a process of bone physiological mineralization can be simulated so as to promote a 
phosphate mineralization process, so that the biomimetic mineralized bone 
repair material withhigh strength can be obtained, and the personalized customization of the bionic mineralized bone 
repair material can be realized; therefore, the preparation methods have a broad application prospectin the field of 
bone tissue engineering.