The sweep frequency shortcircuit impedance analysis (SFSCIA) is an evolving and novel method for the detection of transformer winding deformations. To provide the testing device for measurement of the sweep frequency shortcircuit impedance, this paper analyzed the functional requirements of testing equipment for sweep frequency shortcircuit impedance analysis. DDS was utilized to design the sinewave generator. APEX integrated power amplifier was used to implement the power amplify circuit. Analog to digital converter AD9225 was adopted to construct the high speed acquisition circuit. The sweep frequency shortcircuit impedance tester prototype was developed. Tests were conducted to verify the performance of the prototype. The test results indicate that the tester prototype achieve the design goal and fulfill the demands of the transformer winding test.