Photosynthetic plant culture device

The utility model discloses a photosynthetic plant culture device which comprises a first support, a second support, a third support, a fourth support, a fifth support and a sixth support. The top end of the first support is provided with a top frame, and one side of the top frame is provided with a second support. A plurality of positioning mechanisms are arranged between the first support and the second support, a sunshade net is arranged on the top of the second support, and a protection plate is arranged on the top of the top frame. The positioning mechanism comprises a supporting plate, a plurality of positioning rings, a plurality of anti-skid blocks, a plurality of screw rods and a plurality of cushion blocks, the positioning rings are in sliding connection with the upper surface of the supporting plate, the anti-skid blocks are fixed to one side of the inner wall of the positioning rings, and the screw rods and the cushion blocks are arranged on the other side of the positioning rings. By means of the