The invention discloses a stable peroxyacetic acid disinfectant which relates to a disinfectant. The peroxyacetic acid disinfectant comprises the following raw materials in percentage by mass: 27-39 percent of hydrogen peroxide, 22-36 percent of acetic acid, 0.01-2 percent of compound stabilizer, 0.01-2 percent of surfactant and the balance of water. In the prepared peroxyacetic acid disinfectant, the concentration of the peroxyacetic acid is 15-20 g/100g, the concentration of the hydrogen peroxide is 20-30 g/100g, and the concentration of the acetic acid is 10-20 g/100g. The peroxyacetic acid disinfectant has the characteristics of high peroxyacetic acid concentration, high stability, good disinfection and sterilization effects, simple production process, safety and the like.