The China Spallation Neutron Source (CSNS) is the fourth established pulsed spallation neutron source in the world. With the construction and operation of multiple new neutron instruments, a new generation of streaming data transmission solutions based on message middleware has been formally implemented. This paper presents a streaming data readout and processing software designed to meet the data processing needs of neutron instrument experiments, with a focus on high throughput, high customization, and flexible experimental data analysis. The software has been tested and validated on several neutron instruments at CSNS and is gradually being applied in instrument experiments.