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Stimulated Brillouin scattering in whispering gallery resonators has numerous potential applications. However, previously reported approaches are difficult to integrate and the Brillouin gain coefficient is small. We propose here a new approach to achieve giant forward stimulated Brillouin scattering (FSBS) and lasing on chip with double-disk microcavities made of silica glass. By considering the thickness of air gap to tailor optical forces especially radiation pressure in these double-disk microcavities, giant Brillouin gain enhancement can be realized in the intermode FSBS. The numerical simulation results indicate that for double-disk microcavity within the radius range of 50 μm, stimulated Brillouin scattering gain is ten times larger than that of single-disk microcavity up to 74.3 m⁻¹W⁻¹ with Rayleigh acoustic mode and 10² to 10³ times larger up to 6361.19 m⁻¹W⁻¹ with symmetric Lamb acoustic mode …