In order to improve the testing accuracy of the psychological tester,this study uses STMicroelectronics microcontroller as the core controller,combined with signal processing technology to design a psychological tester that can perform physiological signal monitoring in real time.The research results show that the psychological tester can achieve 91.3%accuracy of subjective assessment,and can complete a variety of human physiological signal acquisition in a short period of time,and finally obtain a comprehensive psy-chological assessment error of only 0.46%.Therefore,the psychological tester can not only realize the subjective mental health as-sessment of the test person,but also monitor the physiological state of the test person to achieve the effect of reducing the test error.The psychological tester has certain application value.