安装库

pip310 install --trusted-host mirrors.aliyun.com pdfrw -i http://mirrors.aliyun.com/pypi/simple/

pdfrw库地址：https://github.com/pmaupin/pdfrw

from pdfrw import PdfReader,PdfWriter
import os

new_title = "www.herokay.cn"
files = os.listdir('./')
for file_path in files:
    if os.path.splitext(file_path)[-1]==".pdf":
        trailer = PdfReader(file_path)
        print(trailer.Info.Title,"\t=>\t",new_title,)
        trailer.Info.Title = new_title
        PdfWriter(file_path, trailer=trailer).write()
print("finish")