The invention relates to liquid type plant nutritional amendment capable of effectively improving plant health and prepared by blending and chelating plant amino acid, chitosan and major elements, middle elements, trace elements, beneficial elements and rare earth elements which are essential for plants. The manufacturing technique is simple, the production cost is low, and no harmful gas or sewage water is generated in the production process. The product of the amendment does not contain artificially synthesized hormone, agricultural chemical substances or any microbial preparation, but can effectively provide about ten nutritive elements and beneficial elements required for the growth of the plants and organic nutrition capable of being directly absorbed and utilized by the plants, and can obviously improve the utilization factor of fertilizer, thereby reducing the investment thereof; at the same time, the product can remarkably improve the health condition of the plants, thereby effectively controlling the happening of physiological diseases and soil-borne diseases of the plants and reducing the investment of the agricultural chemicals. The product can be widely used for the production of various crops, and can increase the yield by about 10% to 30%; simultaneously, the product quality is obviously improved, and the cost conservation and the benefit increase are remarkable.