In the field of airborne measurement and control, the analog output of sensors is often limited by the influence of signal transmission distance and electromagnetic interference, resulting in signal distortion and accuracy reduction, which is difficult to meet the needs of high-precision data acquisition in test flight tests. In addition, for signals that change relatively slowly such as temperature and pressure, the traditional point-to-point multi-wire connection method brings problems such as complex wiring, high installation costs, and limited system flexibility. In order to solve the above challenges, this paper proposes a digital sensor acquisition technology scheme based on PowerBus bus. This solution uses the low-voltage carrier technology and two-wire connection characteristics of the PowerBus bus, combined with the concept of digital conversion of sensors, to build a high-performance acquisition system suitable for slowing signals (such as temperature and pressure). The acquisition system consists of a PowerBus master (bus network node) and a PowerBus slave station (digital sensor). The slave station is responsible for the acquisition, conditioning and high-precision analog-to-digital conversion of the front-end (including platinum resistors, thermocouples, and pressure sensors), and transmits the digitized data through the PowerBus bus. The master is responsible for managing the PowerBus network, receiving data from each slave, and encapsulating and uploading the data. The experimental results show that the system can achieve the internal sampling frequency of 1 ksps and the sampling accuracy of 16 bit effective bits, and realize stable and reliable multi-node sensor data transmission under the rate limit of 9 600 bps of PowerBus bus, which verifies the feasibility and efficiency of the scheme in bandwidth-limited environments such as airborne testing.