The invention relates to a collecting device, in particular to an automatic collecting device for laboratory chemical sewage. The technical problem to be solved is to provide an automatic collection device for laboratory chemical sewage, which can seal collected chemical sewage, prevent odor and harmful substances of the chemical sewage from volatilizing into air, and can clean a collection container after collecting the chemical sewage so as to reduce residues. According to the technical scheme, the automatic collection device for the laboratory chemical sewage comprises a cabinet body, a table board, a cabinet door and the like, a table board is welded to the top of the cabinet body, and a cabinet door is installed on the right front side of the cabinet body through hinges. By rotating the collecting basin, under the matching action of the arc chute and the rolling shaft, the collecting basin and the collecting barrel can be combined or separated, so that chemical sewage can be prevented from leaking, the collecting barrel can be conveniently taken out, and the collecting barrel can be positioned through the matching of the large rubber arc block and the small rubber arc block with the collecting barrel.