Automatic cap capable of being inserted into bottle opening

The utility model provides an automatic cap capable of being inserted into a bottle mouth, which comprises a seat body, a cap piece and a counterweight device, the seat body comprises a sheet body, an inserting rod which is arranged on the bottom side of the sheet body in a protruding mode and can be inserted into the bottle mouth, an output piece which is in a hollow shape with two open ends and is arranged on the top side of the sheet body in a protruding mode, and a conveying channel which is arranged on the top side of the sheet body. The plug-in rod penetrates into the output part from the bottom side of the plug-in rod, the cover part is arranged on the top side of the output part and used for shielding the output part, and the counterweight device is arranged at one end of the cover part and can keep the cover part in a horizontal state. 本实用新型是提供一种可插置于瓶口的自动盖，包含有一座体、一盖件与一配重装置，该座体包含一片体，一插接杆，突设于该片体的底侧，可供插入一瓶口，一输出件，呈二端开口的中空状，突设于该片体的顶侧，一输送道，自该插接杆底侧贯通至输出件内部，该盖件是设于输出件的顶侧，用以遮蔽该输出件，该配重装置是设置于盖件一端，可将该盖件维持于水平状态。