Provided in the present disclosure are an unlicensed spectrum access method and device, and a transmission node. The access method includes: determining, by a transmission node, an access manner of an unlicensed spectrum and an access parameter corresponding to the access manner according to a preset condition, the preset condition comprising at least one of followings: a transmission parameter for information transmitted over the unlicensed spectrum, a type of the information, a grade corresponding to the transmission node, and an access signaling; and accessing, by the transmission node, the unlicensed spectrum according to the determined access manner and access parameter.