Aiming at digital measurement of gap and step difference, a measurement technology based on multisource measurement data fusion was proposed. The measurement method using vision measurement sensor and omnidirectional robot assisting actuator was presented and the measurement system composition was analyzed. Based on the research, measurement process based on measurement data fusion was proposed. In order to measure automatically, multi-system integration framework and control method was studied. Finally, a QT-based gap and step difference measurement software and omnidirectional robot measurement platform was designed and developed to carry out verification. The research provides technical support and methodological guidance for automatic and high-accuracy measurement of gap and step difference.