Adjustable supporting device for bridge tunnel construction

The utility model relates to the technical field of bridge and tunnel construction, in particular to an adjustable supporting device for bridge and tunnel construction, which comprises a bearing bottom plate, adjusting supporting assemblies are correspondingly arranged on the left side and the right side of the end face of the bearing bottom plate, and top protection assemblies are arranged on the upper sides of the adjusting supporting assemblies. The positioning frame is arranged on the adjusting and supporting assemblies, the positioning stability between the two adjusting and supporting assemblies can be high, the top protection assembly can be adjusted and controlled in use at different positions through the adjusting and supporting assemblies, and therefore supporting and protection of bridge and tunnel construction are achieved, and the protection safety of the bridge and tunnel construction is high. The two sets of foldable protection supporting plates are arranged in the top protection assembly so th