The invention relates to the field of heart rate retrieval, in particular to a system for detecting and correcting heart rates. A processor and a computer readable storage medium are arranged on the system. Computer programs on the computer readable storage medium can be executed by the processor, frequency spectrum difference values of current exercise intensity of users and PPG (photoplethysmography) signals can be computed, and tested heart rates HR2 can be positioned by the aid of spectral peak tracking mechanisms; estimated heart rates HR1 can be determined by the aid of preliminarily stored corresponding relation curves; the estimated heart rates HR1 and the tested heart rates HR2 can be weighted and corrected so as to obtain accurate corrected heart rates HR3. The system has the advantage that the problem of heart rate estimation inaccuracy due to irregular exercise can be solved by the aid of the system.