Urban-rural integration development is an important means of realising rural revitalisation, and agricultural and rural modernisation. We used the entropy method, kernel density analysis, the spatial exploratory data analysis method, and a geographic probe to analyse the spatio-temporal evolution characteristics of urban-rural integration and its influencing factors in Hebei Province from 2005 to 2020. We found: First, urban-rural integration in the province's counties shows a fluctuating, albeit overall upward trend. In particular, 2005–2010 exhibited a fluctuating trend, while 2011–2020 exhibited rapid improvement in urban-rural integration. Second, the urban-rural integration development shows some persistence, with faster-developing (slower-developing) areas continue developing faster (slower). Third, the influencing factors of the urban-rural integration level diversify and evolve over time, with the number of dominant factors gradually growing from one to relatively diversified.