The invention relates to an energy-saving technology for producing methyl acetate through reaction and rectification. According to the technology, reaction and rectification are carried out in a low-pressure rectifying tower and a high-pressure rectifying tower at the same time to produce the methyl acetate, and heat exchange is carried out on the tower top steam of the high-pressure rectifying tower and tower bottoms of the lower-pressure rectifying tower so that corresponding energy requirements can be met. According to the energy-saving technology, the energy input to the reaction and rectifying towers is fully utilized and is secondarily utilized, and therefore energy consumption is greatly reduced; the energy-saving technology has obvious practicality and economical efficiency.