Rafting is an effective biotic dispersal mechanism that enables organisms, in particular the terrestrial and coastal ones that are unable to survive in the open ocean, to cross the wide expanses of ocean basins. Studies on modern ecosystems show that floating remains of land plants could serve as dispersal vehicles for diverse organisms, from microscopic fungi to large reptiles. This phenomenon has also been documented in the fossil record, as exemplified by the Triassic crinoid Traumatocrinus colonies attached to driftwood. However, the early history of rafting on land plant remains, and its relationship to the origin and early evolution of land plants, remain poorly understood. Microconchids, a group of small lophophorate-grade encrusting tentaculitoid tubeworms that thrived from the Late Ordovician to the Middle Jurassic, habitually colonized various substrates including land plants. Herein we presented a newly compiled dataset of microconchids and early land plants from the Late Ordovician to Early Devonian, and reconstructed the biogeographic distribution of these organisms. To better evaluate the dispersal history of microconchids during the studied time interval, a new descriptor, the dispersal velocity, was introduced to estimate the dispersal area of microconchids per million years. Our results showed that microconchids underwent rapid biogeographic expansions during the Wenlock of the Silurian and the Early Devonian. Interestingly, these two epochs saw major evolutionary events and great development of early land plants. Considering that microconchids, commonly reported from shallow marine settings, have invaded freshwater habitats as early as the Devonian, the coincidence of rapid microconchid expansion with the emergence of early land plants during the Wenlock suggested that land plant remains may have functioned as a newly emerged type of substrates in promoting the microconchid dispersal. The significant microconchid expansion during the Early Devonian, when the biomass of early land plants was evidently increased as inferred from dramatically elevated diversity and biogeographic expansion of land plants, was likely attributed to the large amounts of land plant substrates that enhanced microconchid rafting. This interpretation is supported by fossil evidence from multiple regions, where many transported plant remains within the coastal to fluvial environments were found encrusted by microconchids. Thus, we proposed that the evolution of early land plants may have played an important role in the global dispersal of microconchids.