Fuente: WIPO "processing tomato" The invention provides an illumination adjusting method and system for tomato double-rootstock grafting. The adjusting method comprises the steps that A, growth information of tomato seedlings grafted with double rootstocks is collected; dividing the double-stock grafted tomato seedlings into an early growth stage, a middle growth stage and a later growth stage; dividing the double rootstocks into a first rootstock and a second rootstock; collecting temperature and humidity in first rootstock growth soil in the early growth stage, and respectively marking the temperature and humidity as first temperature and first humidity; step B, processing the acquired growth information to obtain illumination adjustment parameters; and step C, adjusting the illumination quantity based on the illumination adjustment parameter. Illumination adjustment can be carried out according to the growth condition of the double-stock grafted tomato seedlings, so that the problem that many defects exist in the growth process due to insufficient illumination in the existing grafted tomato growth process is solved.