The invention discloses a PH-regulating magnetic stirrer for an experiment. The PH-regulating magnetic stirrer comprises a box, wherein a magnetic stirring device and a support fixing device are arranged on the box; the PH-regulating magnetic stirrer further comprises a PH tester and a trace control pump; the PH tester is fixed above the magnetic stirring device through the support fixing device;the trace control pump comprises a liquid feeding end connected with a PH regulating liquid and a liquid draining end connected with a reaction liquid; the liquid feeding end is one-to-one corresponding to the liquid draining end so as to form a path for conveying liquid; the PH-regulating magnetic stirrer further comprises a single chip, a display module and an input module; an input end of the single chip is connected with the PH tester and the input module; an output end of the single chip is connected with a control end of the trace control pump and the input end of the display module. ThePH-regulating magnetic stirrer is capable of monitoring the PH value of the reaction on the magnetic stirrer in real time and is capable of automatically regulating the PH value.