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Abstract: 5G offers different data collection methods for different use cases, some of which have faced challenges due to a lack of data providers. The fragmented solutions for individual use cases have high standard overheads and can result in duplicate data collection. Moreover, existing data collection methods are not suitable for collecting the large amounts of data required by 6G new capabilities, such as native AI and sensing. Therefore, in this paper we propose a unified data collection framework based on a 6G data plane (DP). Through the protocol stack of the DP and a two-sided data collection mode, the proposed unified data collection framework is more suitable for collecting large amounts of data. The gain of DP in uplink (UL) processing time was validated by test results based on a 6G user equipment (UE) prototype. As the data packet length increases, the advantage of the DP protocol stack on the UE UL processing delay becomes more significant. By way of rewards or data exchange, the proposed two-sided data collection mode increases the willingness of data providers to provide data. The two-sided data collection mode enables the pos-sibility of digital twin (DT) UEs. DT UEs can reuse a large number of UEs in the physical network to reduce the infrastructure resource overhead incurred by the DT network and improve performance. Therefore, the unified data collection framework pro-vides extensive data functionalities to realize the full potential of the 6G system.