The present invention proposes a heart rate meter, including a signal acquisition circuit, a filter circuit, an operational amplifier circuit, a processing module U4, and a display module U3; the signal acquisition circuit includes an infrared emitting tube D1, an infrared receiving tube Q1, and a resistor R1; the filter circuit includes a resistor R2 , R3, capacitors C1, C2, and C3; the operational amplifier circuit includes operational amplifier U1, operational amplifier U2, resistors R4, R5, R6, R7, capacitors C4, C5, and C6; the processing module U4 is a PIC16F84 microcontroller; the display module U3 is an LCD1602 Display modules. Compared with the prior art, the advantages and positive effects of the present invention are: the circuit structure is simple, the response is fast, the cost is low, the operation is stable, the heart rate of the subject can be measured quickly and conveniently at low cost, and it is easy to carry; The integrated anti-interference structure can filter out most of the high-frequency interference and ensure the reliability of the measurement results.