The utility model relates to a protection open cut tunnel and tunnel structure. The protection open cut tunnel is including spaning the road and setting up the protection casing of the top of road to and set up and subaerial and lie in the basis of road both sides, wherein the bottom mounting of protection casing is in on the basis. Constructor subaerial set up the basis and install the protection casing can, therefore construction convenience, save trouble laborsaving. And should protect the simple structure of open cut tunnel, construction process is succinct, the cost is lower, is particularly useful for under the operating mode such as railway, highway of existing operation.