The invention discloses a nano-
silicon anticorrosive agent for preparing a 
metal working fluid and a preparation method of the nano-
silicon anticorrosive agent, and belongs to the technical field of 
metal working compositions. The preparation method comprises the steps that an organic amine compound and water are mixed, and a 
silane coupling agent is dropwise added under the 
inert gas protection and stirring conditions; and the mixture is heated to a first temperature after dropwise adding is completed, stirred under the 
inert gas protection condition, then heated to a second temperature, stirring under the 
inert gas protection condition, and cooled after stirring is completed to obtain the clear and transparent nano-
silicon anticorrosive agent, wherein the second temperature is higher than the first temperature. The preparation method is simple in process, easy to operate, short in 
processing time, almost free of production danger and production 
pollution in the preparation process and suitable for industrial application and popularization, the obtained nano-silicon anticorrosive agent can stably exist in the 
metal working fluid after being used for preparing the 
metal working fluid, the problems of 
sedimentation, aggregation or 
precipitation and the like are avoided, and the prepared 
metal working fluid has good stability and integrity.