Simple right-angle fixing device

The utility model belongs to the field of construction, and particularly discloses a simple right-angle fixing device which comprises a fixing bottom plate, a limiting check block, a sliding clamping block, a limiting protruding strip and a compression spring. The fixing bottom plate is of an isosceles triangle structure, the two limiting check blocks are symmetrically arranged at the two symmetrical vertex angle positions of the fixing bottom plate, and the limiting protruding strip is arranged at the remaining vertex angle position. The sliding clamping block is arranged in the center of the fixing bottom plate in a sliding mode and is of a trapezoidal structure, the bottom edge of the sliding clamping block is parallel to the limiting protruding strips, the side edges of the sliding clamping block are parallel to the opposite faces of the corresponding limiting check blocks, and the sliding clamping block is connected with the limiting protruding strips through compression springs. The device is easy to op