The invention discloses bacillus amyloliquefaciens and application of liquid preparations thereof in prevention and control of fusarium solani. The strain has a classification name of bacillus amyloliquefaciens, the complete name of the strain is bacillus amyloliquefaciens Ba4, and the strain is collected in China General Microbiological Culture Collection Center in 3# No.1 courtyard on Beichen west road in Chaoyang district in Beijing, China on 12, September in 2013 and has a collection number of CGMCC No.8177. The provided bacillus amyloliquefaciens Ba4 has a special effect on fusarium solani, has high stress resistance, high keeping property, high high/low-temperature resistance and high drying resistance and is suitable for commercial production. Moreover, when the bacillus amyloliquefaciens Ba4 is applied once, the disease can be effectively and continuously controlled for a long time, and the cost is greatly reduced.