The invention relates to the field of planting (A01C), and discloses a vegetable seedling cultivating device which comprises a culture barrel. A culture plate is slidably connected in the culture barrel, the culture plate is parallel to the bottom surface of the culture barrel, and the bottom surface of the culture barrel is provided with a protrusion. The bottom surface of the culture plate towards the protrusion is provided with a groove matched with the protrusion, a film made of latex is attached to the bottom surface of the groove, the film covers the groove and is provided with a plurality of air holes, the air holes are communicated with the groove, the top surface of the culture plate is provided with a through hole, the through hole is communicated with the groove, and a push plate is also disposed above the culture plate. The edge of the push plate and the edge of the culture plate and the inner wall of the culture barrel are slidably sealed. The groove is provided with an air pipe, the air pipe extends upwards and penetrates through the push plate, the push plate is slidably connected with the air pipe, and the air pipe is provided with a check valve only for gas to be discharged. The cultivating device is used for culturing vegetable seedlings and facilitates overall transplanting after the vegetable seedlings are grown.