The invention discloses a brazing method for porous ceramic and metal. Compacting paint which comprises but not limited to yttrium oxide powder, silicon oxide powder, aluminum oxide powder and nano alpha-Si3N4 particles is uniformly sprayed to a to-be-welded surface of the porous ceramic and is heated to 1400 DEG C-1600 DEG C under the protective atmosphere, and heat preservation is conducted for 30 min-90 min, so that a compacting coating is formed on the sprayed surface; and then vacuum brazing is conducted with corresponding brazing filler metal, and thus better connection between the metal and the porous ceramic can be achieved. The invention aims at providing the vacuum brazing method which can achieve more effective high-strength connection between the porous ceramic and the metal, an obtained brazed joint of the porous ceramic and the metal is good in mechanical property, and the practical application requirement can be met.