diff --git a/ee/app/models/approval_project_rule.rb b/ee/app/models/approval_project_rule.rb
index c1222a366f6df85caa03f20c62375ab19ab85bde..4ee5d6dc1bc48d9bc4ea805423468f5f73485386 100644
--- a/ee/app/models/approval_project_rule.rb
+++ b/ee/app/models/approval_project_rule.rb
@@ -13,6 +13,8 @@ class ApprovalProjectRule < ApplicationRecord
 
   alias_method :code_owner, :code_owner?
 
+  validates :name, uniqueness: { scope: :project_id }
+
   def source_rule
     nil
   end
diff --git a/ee/changelogs/unreleased/weimeng-prevent-approval-group-name-collision.yml b/ee/changelogs/unreleased/weimeng-prevent-approval-group-name-collision.yml
new file mode 100644
index 0000000000000000000000000000000000000000..0167427775b7ab666df7be9e935107c995f63ea9
--- /dev/null
+++ b/ee/changelogs/unreleased/weimeng-prevent-approval-group-name-collision.yml
@@ -0,0 +1,5 @@
+---
+title: Prevent project's approval rules having same name
+merge_request: 16216
+author:
+type: fixed
diff --git a/ee/spec/factories/approval_rules.rb b/ee/spec/factories/approval_rules.rb
index 83a164bd09de25a8298e43adbd91e95a35777fce..d89025071211bba391079e7d0c915a5c0c69d1e1 100644
--- a/ee/spec/factories/approval_rules.rb
+++ b/ee/spec/factories/approval_rules.rb
@@ -22,7 +22,7 @@
 
   factory :approval_project_rule do
     project
-    name ApprovalRuleLike::DEFAULT_NAME
+    sequence(:name) { |n| "#{ApprovalRuleLike::DEFAULT_NAME}-#{n}" }
     rule_type :regular
 
     trait :security_report do
diff --git a/ee/spec/models/approval_project_rule_spec.rb b/ee/spec/models/approval_project_rule_spec.rb
index c09b81b2229a106b8787865638340f440e943e04..5ad418de83fbd8a0db9260cf256e58a7b0491e6b 100644
--- a/ee/spec/models/approval_project_rule_spec.rb
+++ b/ee/spec/models/approval_project_rule_spec.rb
@@ -5,6 +5,10 @@
 describe ApprovalProjectRule do
   subject { create(:approval_project_rule) }
 
+  describe 'validations' do
+    it { is_expected.to validate_uniqueness_of(:name).scoped_to(:project_id) }
+  end
+
   describe '.regular' do
     it 'returns non-report_approver records' do
       rules = create_list(:approval_project_rule, 2)