The invention discloses a high-voltage and direct-current quick disconnecting switch. The high-voltage and direct-current quick disconnecting switch comprises a sealing tank body, a high-voltage electrode and a low-voltage electrode. Two disc insulators, four moving contacts, four static contacts, four conductive button contacts, five insulating supports, three conducting rods, four operating mechanisms, four keeping units and four buffering units are arranged in the sealing tank body. The moving contacts are driven by the operating mechanisms to make contact with or to be separated from the static contacts. When the moving contacts make contact with the static contacts, the three conducting rods are connected in series so that an electrically-conductive path can be formed between the high-voltage electrode and the low-voltage electrode. When the moving contacts are separated from the static contacts, multiple fractures are formed between the three conducting rods to bear the high voltage between the high-voltage electrode and the low-voltage electrode. The high-voltage and direct-current quick disconnecting switch has the advantages that all the components are arranged in the tank body, the lengths of insulating pull rods are reduced, and therefore loads of the operating mechanisms are reduced, and multi-fracture synchronous rapid separating and combining can be achieved on the premise of the permitted mechanical strength. The high-voltage and direct-current quick disconnecting switch can be applied to 200kV high-voltage situations.