The invention relates to a solanaceous greenhouse vegetable special-purpose nutritional compound fertilizer used for improving soil hardening, and an application method thereof. The solanaceous greenhouse vegetable special-purpose nutritional compound fertilizer is composed of 15 to 36% of compost tea, 57 to 72% of major element phosphorus nitrate-potassium sulphate composite fertilizer, 6 to 14% of a soil conditioner, and 0.1 to 0.3% of a leaf fertilizer. The solanaceous greenhouse vegetable special-purpose nutritional compound fertilizer is capable of satisfying requirements of solanaceous greenhouse vegetables at different stages of growth period after transplanting on nutrients; compost tea comprises a large amount of organic matters and microbial communities; supplying and activation of soil nutrients can be realized via supplying of soil organic matters and metabolic activity of microorganisms, and soil structure is improved effectively. Soil fertilization is realized via gradual adding of compost tea, and environmental risk caused by large amount application of farmyard manure in one time is avoided.