The invention discloses a 
dyeing and finishing process of underwear fabric, which comprises the following steps: (1) pretreatment; (2) 
dyeing; (3) finishing: adding 1-2 parts by weight of gamma-(3-glycidoxypropyl) trimethoxysilane, 1.2 parts by weight of 4-Br-2-n-octylisothiazolinone, 0.9 part by weight of 
salicylanilide and 3.6 parts by weight of 
acrylic acid into 15 parts by 
mass of deionized water, and stirring uniformly; then adding 0.9 part by weight of bioresmethrin, 0.7 part by weight of 
isocyanuric acid triallyl ester, 0.9 part by weight of 
polyamide and 1.4 parts by weight of 3-(2-aminoethyl)-aminopropyl methyl dimethoxy 
silane, and continuously stirring till full and uniform mixing to prepare finishing liquid; then padding the fabric in the finishing liquid, taking out and 
drying at constant temperature.The fabric dyed and finished by the 
dyeing and finishing process has excellent mildewproof, mothproof, antibacterial, antiflaming and antistatic performances, and is high in washing resistance and soft in handfeel.