The utility model belongs to the technical field of the steel construction building, concretely relates to funnel formula sand box uninstallation device is uninstalled to the interim support frame of supporting steel member, four bolts in the horizontal relief part spare need to twist before uninstallation at the beginning to remove, and the slip of steel member between the horizontal displacement of uninstallation in -process is through corrosion resistant plate and slide is next releases effectively, this uninstallation device design is novel, can conveniently unload to the interim support frame of steel construction, have the leakproofness good, can release advantages such as strong point horizontal displacement, operation facility, security height.