A respiratory mask and an adjustment assembly thereof are provided. The adjustment assembly provided comprises: a forehead fixing device, adapted to fix the respiratory mask on a users forehead an adjustment device, comprising a base body and multiple connectors set on the base body, wherein, the connector is adapted to connect with the forehead fixing device, and an adaption connector is chosen by the user from the multiple connectors to connect with the forehead fixing device according to the users forehead. By setting multiple connectors which can be connected to the forehead fixing device and allow a connector to be chosen from the multiple connectors and be connected with the forehead fixing device according to a users forehead, the respiratory mask can fit different users foreheads to avoid the air leakage caused by the mask motion during users sleeping. Furthermore, the structure and manufacture process of the adjustment assembly in the present invention are simplified, less parts or pieces are included, and the costs greatly reduce.
