diff --git a/graphene_django/tests/test_types.py b/graphene_django/tests/test_types.py
index 0cd0740..c74a6b9 100644
--- a/graphene_django/tests/test_types.py
+++ b/graphene_django/tests/test_types.py
@@ -242,6 +242,27 @@ def test_django_objecttype_only_fields_and_fields():
                 fields = ("id", "email", "films")
 
 
+@with_local_registry
+def test_django_objecttype_all_fields():
+    class Reporter(DjangoObjectType):
+        class Meta:
+            model = ReporterModel
+            fields = "__all__"
+
+    fields = list(Reporter._meta.fields.keys())
+    assert fields == [
+        "id",
+        "first_name",
+        "last_name",
+        "email",
+        "pets",
+        "a_choice",
+        "reporter_type",
+        "films",
+        "articles",
+    ]
+
+
 @with_local_registry
 def test_django_objecttype_exclude_fields():
     class Reporter(DjangoObjectType):
diff --git a/graphene_django/types.py b/graphene_django/types.py
index 145e9a9..855761c 100644
--- a/graphene_django/types.py
+++ b/graphene_django/types.py
@@ -24,6 +24,9 @@ if six.PY3:
     from typing import Type
 
 
+ALL_FIELDS = "__all__"
+
+
 def construct_fields(
     model, registry, only_fields, exclude_fields, convert_choices_to_enum
 ):
@@ -121,12 +124,15 @@ class DjangoObjectType(ObjectType):
             raise Exception("Can't set both only_fields and fields")
         if only_fields:
             fields = only_fields
-        if fields and not isinstance(fields, (list, tuple)):
+        if fields and fields != ALL_FIELDS and not isinstance(fields, (list, tuple)):
             raise TypeError(
                 'The `fields` option must be a list or tuple or "__all__". '
                 "Got %s." % type(fields).__name__
             )
 
+        if fields == ALL_FIELDS:
+            fields = None
+
         # Alias exclude_fields -> exclude
         if exclude_fields and exclude:
             raise Exception("Can't set both exclude_fields and exclude")