The invention discloses a precision concrete carbonization measuring method. The method comprises the following steps: first, parameters are calibrated aimed at specific devices and standard reagents, a precision digital display device is set; second, a sample to be measured are placed in a reaction bottle; third, an acid solution is injected into a solvent chamber; fourth, the precision digital display device and a sensor are connected, then the sensor is connected with a duplex sealing plug, then a pressure chamber of a reagent bottle is arranged on the duplex sealing plug in the horizontal direction, and that the acid solution in the solvent chamber does not split is ensured, and finally the reaction bottle and the duplex sealing plug are connected; fifth, the reaction bottle is erected, the acid solution in the solvent chamber flows out, a reaction is carried out, the generated gas pressure is introduced to the sensor from the duplex sealing plug, data are sent to the precision digital display device through the sensor, and the precision digital display device processes the sensor electrical signals and then show results. the content of CaCO3 in concrete can be measured accurately through the measuring method, and concrete carbonization conditions are evaluated accurately. The method is simple and easy to operate, and measurement cost is low.