The invention relates to a solid foaming drainage agent composition as well as a preparation method and application thereof and belongs to the technical field of petrochemical engineering. The solid foaming drainage agent composition disclosed by the invention comprises the following components in parts by mass: 1 part of alkylamine polyether benzene sulfonate, 0.1-50 parts of long-chain polyethernitrogen-containing compounds, 0.2-100 parts of solid fillers and 0-0.5 part of an adhesive. By virtue of the technical scheme in the invention, the solid foaming drainage agent is subjected to foaming performance test according to SY/T 6465-2000 Foaming Agent Evaluation Method for Foaming Drainage Gas Recovery, the foaming height is more than 200mm in 0-200000 mg/L of salinity brine, the liquorcarrying capacity is more than 150mL, and when aged at a high temperature of 180 DEG C for 24 hours, the change ratio of the foaming height and drainage performance of the foam is less than 5%. The solid foaming drainage agent composition has excellent temperature resistance, salt resistance, foaming performance and liquor carrying capacity, and excellent technical effects are achieved.