The invention relates to the technical field of soil agrochemistry, in particular to a soil improvement method based on multi-season pineapple planting and a modifier thereof. The soil improvement method based on multi-season pineapple planting comprises the following steps: (1) deeply ploughing soil; uniformly mixing coconut shell
charcoal and quicklime
powder, applying the mixture to the deeply ploughed soil, and continuously applying a
soil conditioner after rotary
tillage; ridging is performed after rotary
tillage is performed for 1-2 times, so that turtle-back-shaped
ridge bodies are formed; (2) the surface of the
ridge body is covered with a black mulching film in the longitudinal direction of the
ridge body, seed holes with the
diameter being 3-5 cm are reserved in the black mulching film, pineapple
bud seedlings with 2-3 leaves are planted in the seed holes, and root fixing water is thoroughly watered; (3) irrigating with a
water dispersible fertilizer solution after field planting of the pineapple
bud seedlings; irrigating for 1-2 times by adopting a
water dispersible fertilizer solution in a flowering period; (4) performing conventional field management, and harvesting after maturing. The method not only promotes the environment to be stable and nutrients to be sufficient, but also has a remarkable soil improvement effect, remarkably improves the
sugar degree of pineapple fruits and greatly improves the yield.