The invention provides a method for preparing nickel nano particles in porous glass, which comprises the following steps: 1) selecting porous glass; 2) dissolving a nickel compound in a solvent to obtain a solution of which the concentration is within a range of 1 to 1*10<-6> mol/L; 3) placing the porous glass in the solution obtained in step 2), soaking for more than 0.5 hour until the solution sufficiently penetrates into micro pores of the porous glass; and 4) heating the porous glass obtained in step 3) in a heating furnace, preserving the temperature for a certain time, and cooling to room temperature, thus obtaining evenly distributed nickel nano particles in the porous glass. The method for preparing nickel nano particles in porous glass can effectively limit the dimensions of the particles, and by using the settings of process parameters, the nickel nano particles have favorable dispersibility in the glass and are evenly distributed.