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In the synchronous acquisition of crop multi-source information, integrating multi-source sensors to realize the synchronous acquisition of crop phenotype information has become the current trend of crop phenotype acquisition. Aiming at the key problem of dynamic synchronous acquisition in unstructured environment, in order to accurately and synchronously capture the multidimensional phenotypic feature data of crops at a specific time, a fixed multi-phenotypic trait imaging unit device was designed based on depth camera, binocular camera, thermal infrared camera and multispectral camera. The research on time synchronization acquisition of sensor data was carried out based on precision time protocol (PTP), broke through the time synchronization parallel acquisition technology of multi-source heterogeneous sensors, and realized the time synchronization acquisition of multi-dimensional imaging characteristics of crop phenotypes in unstructured environment. For the time synchronization and stability of the system, a continuous 72 h test was carried out. The root mean square error of time synchronization error between the system clock of the timing board of each sensor (slave clock) and the 1-PTP clock of the timing board (master clock) was less than 132 ns, and the long term jitter was less than 286 ns. This result showed that the time synchronization error met the technical requirements. In order to evaluate the stability and reliability of the system, totally 100 experiments were carried out on crops with high intensity continuous sampling. The results showed that the system showed good stable performance in the whole experiment process, and can stably complete the continuous acquisition task. Under the condition of time synchronization, each sensor was synchronously triggered by the timing board, and the acquisition time error was controlled within 1 ms. The stability and dynamic performance of the system met the actual needs of agricultural production.