In order to address the challenges in flexible formwork gob-side entry retention construction—such as prolonged processes, high labor intensity, excessive personnel requirements, and low efficiency during concrete pumping equipment relocation, pipeline layout, and other procedures—an independently developed?self-propelled concrete pumping system for flexible formwork gob-side entry retention?has been introduced. To investigate the vibration characteristics of the conveying pipeline in the self-propelled concrete pumping system, a pipeline model of the pumping system was firstly developed. The forces on straight and elbow pipes during pumping were analyzed to determine boundary conditions and parameters for the pipeline model.. Secondly, through free modal analysis and modal linear superposition of a single-section pump pipe, the modal zero position of the pipe section was identified and designated as the pipeline support point. The relationship between the number of pipeline sections and the free modal frequencies was summarized. Subsequently, a harmonic response vibration analysis was perfomed on the conveying pipeline under combined loads of concrete gravity, friction, and pipeline self-weight. The vibration amplitudes and stresses of the pipeline under different support constraints were obtained. Finally, a rigid-flexible coupling analysis of the pipeline was conducted to derive support reaction forces and validate the harmonic response results. The results indicate that the modal zero position (optimal support location) is located?415 mm from the pipe end; the first six free modal frequencies of a single-section pump pipe exhibit an inverse hyperbolic relationship with the number of pipeline sections; the optimal support spacing for the pipeline is 1 section; and gravity of the mobile support device must exceed 117.74N to ensure stability.