Transversely-loaded temporary supporting device for sandbox

The utility model provides a transversely-loaded temporary supporting device for a sandbox, which aims to solve the technical problems, guarantees the safety and stability of a lateral template of a pouring step of an operation level bed plate and also guarantees the rapidness and the portability of detaching a temporary support before a spring vibration isolator at the bottom of the operation level bed plate is released. The transversely-loaded temporary supporting device for the sandbox comprises a base, a box body module, a top cover and a foldable plate, wherein the box body module is composed of two flat plates which are separated; the top end of the box body module is covered by the top cover; the bottom end of the box body module is placed in the base; the inner sides of L-shaped folding angles at the two ends of the box body module are covered by the foldable plate; the sandbox for placing sand is composed of the base, the box body module, the top cover and the foldable plate; the base is provided wit