Gene engineering bacteria for producing L-arginine and construction method and application of gene engineering bacteria

A construction method of a genetically engineered bacterial strain, comprising the following steps:

• (1) integrating pyrAA and pyrAB genes into a genome of Escherichia coli used as a starting strain;
• (2) integrating at least one arginine biosynthesis pathway enzyme gene selected from the group consisting of argC, argJ, argB, argD, argF, argG, and argH genes;
• and integrating lysE gene encoding an arginine transporter;
• and
• (3) knocking out a gene encoding an arginine decarboxylase,
• a gene encoding an arginine succinyltransferase, and
• a gene encoding an acetylornithine deacetylase;
• wherein,
• the gene encoding an acetylornithine deacetylase includes at least one of speA and adiA genes;
• the gene encoding an arginine succinyltransferase is astA gene;
• and
• the gene encoding an acetylornithine deacetylase is the argE gene.