The utility model relates to the technical field of protective sheet
metal house main body frameworks, in particular to a cross-shaped connecting piece used for assembling an outer protective sheet
metal house main body framework, which comprises a transverse support, the transverse support is fixedly connected with a vertical support through
welding, and a steel
pipe used for connecting a house body is arranged in the transverse support. A first abutting block used for limiting the depth of a steel
pipe is arranged in the transverse support, auxiliary grooves used for increasing anti-skid objects are symmetrically formed in the vertical support, limiting clamping rods used for reinforcing bolts are symmetrically arranged on the transverse support, and the first abutting block is fixedly connected with the inner wall of the vertical support through a
fastener. Through the arrangement of the limiting clamping rods and the fixing clamping grooves, after the steel pipes in the transverse support are fixed by the bolts, the phenomenon that the bolts are loosened due to
human environment influences can be avoided, meanwhile, after the limiting clamping rods are fixed, the bolt fixing effect can be improved, and the supporting strength of the steel pipes in the transverse support is further improved.