How can I run multiple raw queries with sequelize in MySql?

Depending on the underlying mysql module being used, at least mysql/mysql2 supports the multipleStatements: true connection setting. This will allow you to send multiple queries at once. By default it is disabled for security reasons.

You can pass the multipleStatements option using

new Sequelize(user, pass, db, {
  dialectOptions: {
    multipleStatements: true
  }
});

Anything you put into dialectOptions will be passed on to the underlying connection lib (in this case mysql)