The invention discloses a high efficiency fertilizer helpful for improving the brittleness and the mouthfeel of big turnips. The high efficiency fertilizer comprises, by weight, micro-molecular plant polysaccharides, calcium gluconate, betaine, magnesium glycinate, sodium selenite, compound sodium nitrophenolate, carboxylated multiwalled carbon nanotubes, paulownia sawdust, dry turfy soil, livestock and poultry night soil, rice bran powder, humic acid, EM probiotics, agricultural composite microbial florae, chitin, taurine, shale fly, tourmalinite, polyvinylpyrrolidone, a proper amount of plasma activated water rich in nanometer silicon ions, konjak powder, viscose rice chaff ash and a proper amount of water. The fertilize prepared through adopting a compound containing micro-molecular plant polysaccharides, calcium gluconate and plasma activated water rich in nanometer silicon ions, cooperating with a main material prepared from a nutrient solution and compost, and coating with an external layer coating liquid has the characteristics of dual release, abundant nutrition, full promotion of absorption and utilization of nutritional substances by turnips, and realization of modification and high efficiency cultivation of the turnips.