The invention discloses a 
hydrogen-rich liquid biological improvement agent for a 
saline and alkaline land as well as a preparation method and application thereof. The 
hydrogen-rich liquid biologicalimprovement agent is prepared from the following raw materials in parts by weight: a 
solvent and 
hydrogen element which is dissolved into the 
solvent, wherein the saturation degree of hydrogen in thesolvent is 0.1 to 100%; the 
solvent is supplied by running water or 
irrigation water. The preparation method comprises the following steps of S1, firstly, preparing hydrogen gas, mixing the hydrogen gas and the solvent by a jet device, sending into a 
static mixer through a water pump, and finally forming the hydrogen-rich liquid biological improvement agent for the 
saline and alkaline land througha nanometer releasing device; S2, application of the hydrogen-rich liquid biological improvement agent for the 
saline and alkaline land: directly conveying the hydrogen-rich liquid biological improvement agent for the saline and alkaline land to the 
plant roots via pipelines in ways of agricultural 
drip irrigation, 
permeation irrigation and the like. The hydrogen-rich liquid biological improvement agent for the saline and alkaline land has the advantages that the cost is low, the stability is high, the 
pollution is avoided, the residue is avoided, and the environment-friendly effect is realized.