在Linux 系统中运行：

import os
from PyPDF2 import PdfReader, PdfWriter
from PIL import Image
from pdf2image import convert_from_path  


def split_pdf(input_folder, output_folder):
    if not os.path.exists(output_folder):
        os.makedirs(output_folder)

    for filename in os.listdir(input_folder):
        if filename.endswith('.pdf'):
            reader = PdfReader(os.path.join(input_folder, filename))
            writer = PdfWriter()

            for page_num in range(1, len(reader.pages)):
                page = reader.pages[page_num]
                #page_image = page.to_image()  # 使用to_image()将PDF页面转换为图像
                page_image = convert_from_path(os.path.join(input_folder, filename), first_page=page_num, last_page=page_num)[0]
         
                # 分割图像
                width, height = page_image.size
                left_image = page_image.crop((0, 0, width // 2, height))
                right_image = page_image.crop((width // 2, 0, width, height))

                # 生成新PDF
                left_image_path = f'{output_folder}/{filename[:-4]}_left_{page_num}.pdf'
                right_image_path = f'{output_folder}/{filename[:-4]}_right_{page_num}.pdf'

                left_image.save(left_image_path, 'PDF')
                right_image.save(right_image_path, 'PDF')

                # 将右侧部分排在左侧前面
                writer.add_page(PdfReader(right_image_path).pages[0])
                writer.add_page(PdfReader(left_image_path).pages[0])

            output_pdf_path = os.path.join(output_folder, filename)
            with open(output_pdf_path, 'wb') as f:
                writer.write(f)

input_folder = 'guanlangaoshou'
output_folder = 'guanlanSinglePage' 
split_pdf(input_folder, output_folder)

这个程序把分开的单页也保存下来了， 要清楚再执行下面的程序删除掉这些文件只保留拼接后的最终结果：

import os

def delete_files_with_keywords(folder_path):
    # 关键字列表
    keywords = ['right', 'left']
    
    # 遍历文件夹中的所有文件
    for filename in os.listdir(folder_path):
        # 检查文件名是否包含任何关键字
        if any(keyword in filename for keyword in keywords):
            file_path = os.path.join(folder_path, filename)
            try:
                # 删除文件
                os.remove(file_path)
                print(f"Deleted: {file_path}")
            except Exception as e:
                print(f"Error deleting {file_path}: {e}")

# 指定文件夹路径
folder_path = 'D:\\BaiduNetdiskDownload\\guanlanSinglePage'

# 调用函数删除文件
delete_files_with_keywords(folder_path)