The utility model discloses a device for improving warming heat efficiency of seedbed seedling culture and belongs to the technical field of seedling culture. A heating layer of the device for improving the warming heat efficiency of the seedbed seedling culture consists of a heat slow release layer, and n rows of parallel electric heating wires which are arranged inside the heat slow release layer. In a heating process, the time delay of heat conduction is improved, so that the temperature uniformity between areas on a seedling hole tray can be ensured; the areas on the seedling hole tray can be heated and controlled independently, so that the precision for temperature control is improved; and a heat isolating layer is arranged on the lower side of the heating layer and a heat-preserving cover is arranged above the seedling hole tray, so that heat in the heating layer can be prevented from being dispersed into air and the heating efficiency is improved.