The invention relates to a blood pressure measuring module and a blood pressure measuring method. The measuring module comprises a cuff, a charging and discharging control module, a pressure detectionmodule, a pressure processing module, CPU, a sound detection module for collecting pulse sound and a sound processing module for amplifying and filtering the collected pulse sound. In one measurement, the CPU is used for searching the pulse wave and pulse sound automatically, obtaining pulse wave and pulse wave sequence corresponding to cuff pressure, pulse sound and pulse sound sequence corresponding to cuff pressure, blood pressure data of an oscillation method and blood pressure data of an auscultatory method, giving reasonable and accurate final measurement result according to comparisonto two groups of blood pressure data and judgment of signal quality, and providing reliable data for diagnosing the blood pressure condition of patients accurately. Meanwhile, the invention realizes the self-adapting charging manner of determining the charging target pressure according to the pulse amplitude, and has the advantages of simple operation as well as rapid and accurate measurement.