The invention discloses a parallel flow heat accumulating type lime kiln production technology based on CO2 accumulation. The parallel flow heat accumulating type lime kiln production technology includes the steps that limestone raw materials are fed into two kiln chambers of a parallel flow heat accumulating type lime kiln; carrier gas is sprayed into the kiln chambers; combustion supporting gas is fed; in a combustion zone of the current kiln chamber, limestone absorbs the heat generated by fuel combustion to be decomposed to generate quick lime and CO2 gas; the quick lime is discharged after being cooled to 80 DEG C to 100 DEG C; cooling gas, the CO2 gas generated by decomposing the limestone and CO2 gas generated by fuel combustion are mixed to enter the other kiln chamber to preheat limestone; flue gas generated by preheating releases heat to the limestone, then the temperature of the flue gas is reduced, the flue gas is exhausted, and CO2 gas with the volume concentration larger than 95% is generated; the parallel flow heat accumulating type lime kiln starts reversing work. By means of the parallel flow heat accumulating type lime kiln production technology, the high-purity CO2 gas is obtained while the high-quality lime is prepared. Compared with an existing technology, circulation of N2 in a system is avoided, the energy used for heating the N2 is saved, and the flue gas is recycled to achieve the aims of increasing the product added value, saving energy and reducing consumption.