Objective A kind of heart function analytical device is invented based on impedance cardiography method to detect heart function economically, fast and comprehensively. The device can detect and analyze ICG, ECG and PCG signals synchronously, so comprehensive noninvasive assessment of heart function in patients can be achieved. Methods This article introduces the system and main hardware modules of the device, describes the process of ICG acquisition. FPGA and DDS are used as hardware core and performance indices of the device are pointed out. Key points of signal processing are presented and the electromagnetic principle of mutual inductance is used in this part. Results By analyzing and comparing clinical data, this article indicates that the device can gain more accurate clinical test data and has better clinical applicability. Conclusions Because of its advanced feature points’ extraction method, this device meets the requirements of clinical examination and assessment for heart function.