A method and a device for adding an emoji, an apparatus and a storage medium are provided. When a second user replies to a target message with an emoji in a first session interface, the first user may trigger an emoji addition instruction for the emoji, and the emoji is added to an emoji input candidate box of the first user. With the method for adding the emoji according to embodiments, the emoji replied to the target message by the second user can be added to the emoji input candidate box of the first user, which can increase emojis in the emoji input candidate box of the first user, and meet the requirements of the first user sending various emojis.