The invention belongs to the technical field of biological detection, and particularly relates to a natural
antigen P1 for detecting an anti-
mycoplasma pneumoniae
antibody as well as a preparation method and application of the natural
antigen P1. The preparation method comprises the following steps of taking an inactivated human
mycoplasma pneumoniae
antigen culture solution, centrifuging to obtain
mycoplasma pneumoniae thalli, washing with a mycoplasma washing solution, centrifuging, and discarding supernatant and precipitate to obtain
mycoplasma pneumoniae; putting into a
lysis solution, carrying out water bath incubation at 37 DEG C, carrying out
cryopreservation at -20 DEG C, then carrying out re-melting, carrying out resuspension on the centrifuged precipitate by using a mycoplasma washing solution, and carrying out
centrifugation to leave the precipitate; resuspending the precipitate in the
lysis solution, carrying out ultrasonic treatment, and centrifuging to obtain a supernatant which is an antigen crude product; and carrying out centrifugal
ultrafiltration on the supernatant obtained by filtering the crude product, and collecting the
protein on the membrane, namely the natural antigen P1. The method is simple in step and suitable for popularization and
mass production, and the prepared natural antigen P1 has good specificity and sensitivity to the
mycoplasma pneumoniae antibody, so that the clinical detection sensitivity and specificity of the
mycoplasma pneumoniae antibody in
disease diagnosis are further improved.