A kind of plant culture plant material dehydration device and its compression assemblies, the compression assemblies include: an extrusion and at least an actuator, wherein, the extrusion includes the first pivoting portion of a press section and an opposite press section, aforementioned actuator system pushes away aforementioned extrusion to support, and aforementioned actuator includes a drive rod and a second pivoting portion, and second pivoting portion system position is in the drive rod, and it is pivotally connected the first pivoting portion, so that the relatively aforementioned drive rod of aforementioned extrusion is swung. Thereby allow extrusion extrusion structure is closely knit, porousness is different or stack height is different plant material when, which can thereby improve the durability of compression assemblies with respect to the drive rod beat, to reduce the torque that drive rod is born.一種植物用培養植材脫水裝置及其擠壓組件，該擠壓組件包含：一擠壓件及至少一驅動件，其中，該擠壓件包括有一擠壓部及一相對該擠壓部之第一樞接部，前述驅動件係用以撐推前述擠壓件，而前述驅動件包括一驅動桿及一第二樞接部，該第二樞接部係位在該驅動桿，並樞接該第一樞接部，以供前述擠壓件相對前述驅動桿擺動。藉此讓擠壓件擠壓結構密實、疏鬆程度不一或堆疊高度不同的植材時，該擠壓件可相對該驅動桿偏擺，以減少驅動桿所承受的扭矩，藉此提高擠壓組件的耐用性。
