The utility model provides a lodging device is prevented to frame construction easy -to -draw treasured, support rectangle pole, precious, the middle supporting rod of easy -to -draw on, including themain tributary vaulting pole, the main tributary vaulting pole pass through the fix with screw subaerial, support the rectangle pole on and pass through the fix with screw on two main tributary vaulting poles, easy -to -draw treasured upper end through the fix with screw last support the rectangle pole on, the lower extreme is shelved subaerial, middle supporting rod pass through the screw and fix respectively at the last rectangle pole and subaerial that supports. When carrying out outdoor show, fix the mobile jib on ground, easy -to -draw treasured upper end fix last support the rectangle pole on, will go up again and support the rectangle pole and fix on the mobile jib, the material that reaches the effect of the precious anti slope of easy -to -draw and support on, the rectangle poleis aluminium alloy material, the intensity high quality is little, conveniently gets and puts, install 1 between two mobile jibs 3 individual middle supporting rod 4 supports the rupture of rectanglepole on, when preventing that the wind resistance is too big.