ImageField只能存储一个图像。你能做什么：
为图像创建单独的模型：

#models.py
class MyImage(model.Model):
    image = models.ImageField('my image', default=None)
    
    #here you need to specify what model this images will be related to(which model you want to add several images with ImageField) lets say it is model "MyModel"
    my_model = models.ForeignKey(MyModel,
                          on_delete=models.CASCADE,
                          related_name='images')

    def preview(self):
        # this is needed to see model as actually image in admin
        full_url = str(self.image.url)
        return format_html('<img src="{}", width=200, height=200>', full_url)

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然后你需要在admin中将其添加为inline：

#admin.py
from .models import Image, MyModel
from django.contrib import admin

class ImageInline(admin.TabularInline):
    model = Image
    extra = 1
    fields = ('image', 'preview')
    readonly_fields = ('preview', )

@admin.register(MyModel)
class MyModelAdmin(admin.ModelAdmin):

    inlines = [ImageInline]


admin.site.register(Image)

型