The influence of frequent magnetic field stimulation (MFS) on plants is the subject of intense research. The effects of MFS on plants vary depending on its intensity, time of exposure or application form. The effects of low-frequency magnetic field in two doses, 0.2 mT, 16 Hz (MFS-1) and 0.2 mT, 50 Hz (MFS-2) on the mitotic activity and selected physiological and biochemical parameters in narrow-leafed lupin (Lupinus angustifolius L.) were evaluated. Non-exposed plants were used as control (C). It was noted that after the exposure of plants to MFS-1, the biometric parameters, mitotic activity, BSA and GPOX activity remained at the control level. However, a significant decrease in the assimilation pigment content was observed. On the other hand, the exposure of plants to MFS-2 was manifested by a decrease in the biometric parameters, mitotic activity and the assimilation pigment content, but an increase in GPOX activity in roots was noted.