t1前面不能保护into子句：

CREATE TRIGGER t_up
   BEFORE INSERT
   ON t
   FOR EACH ROW
BEGIN
   INSERT  t1(name) values ('insert');
   end;

mysql> show TRIGGERs;
+---------+--------+-------+--------------------------------------------------------+--------+---------+--------------------------------------------+---------+----------------------+----------------------+--------------------+
| Trigger | Event  | Table | Statement                                              | Timing | Created | sql_mode                                   | Definer | character_set_client | collation_connection | Database Collation |
+---------+--------+-------+--------------------------------------------------------+--------+---------+--------------------------------------------+---------+----------------------+----------------------+--------------------+
| t_up    | INSERT | t     | BEGIN
   INSERT  t1(name) values ('insert');
   end | BEFORE | NULL    | STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION | root@%  | utf8                 | utf8_general_ci      | utf8_general_ci    |
+---------+--------+-------+--------------------------------------------------------+--------+---------+--------------------------------------------+---------+----------------------+----------------------+--------------------+
1 row in set (0.00 sec)

mysql> insert into t values ('bcc');
Query OK, 1 row affected (0.02 sec)

mysql> select * from t1;
+--------+
| name   |
+--------+
| insert |
+--------+
1 row in set (0.00 sec)

mysql> update t set name='cccc';
Query OK, 4 rows affected (0.00 sec)
Rows matched: 4  Changed: 4  Warnings: 0

mysql> select * from t1;
+--------+
| name   |
+--------+
| insert |
+--------+
1 row in set (0.00 sec)