Magnetically controlled shape memory alloy (MSMA) is widely concerned because of its superior characteristics in the field of functional materials. The application of MSMA materials base on experimental study, thus a comprehensive testing device of MSMA external characteristics is developed in this paper, which can simultaneously measure deformation, pressure, temperature and magnetic field. Experimental and testing device of the instrument are analyzed and designed. The curves between MSMA deformation rate and magnetic field, temperature are obtained with the testing device. The experimental results show the device can conveniently test the external characteristics of MSMA materials.