An internal hollow planting tray is formed by blow molding and made of thermoplastic materials. Multiple planting holes gradually narrowing from top to bottom are evenly distributed on the planting tray, and multiple relatively convex positioning protrusions are set on an inner side of each planting hole for holding around a foam filling member provided to support the planted plants passing through the planting holes. Two relative side concave portions set on an upper edge of each planting hole are provided for fingers to insert to place and take the filling member. Furthermore, two main flow channels are respectively set on two sides of the planting tray. The main flow channel may be respectively communicated with multiple secondary flow channels and minor flow channels as required, to place droppers or provide nutrient solution flowing.