The invention discloses a building wall painting and trowelling device which comprises a moving mechanism, a supporting mechanism, a transmission mechanism and a painting mechanism, the moving mechanism is used for moving the device and comprises a
workbench, a rotating shaft, a threaded block, a
turbine, a fixing block, wheels and a rotary knob, the rotating shaft is rotationally connected to the interior of the
workbench, the threaded block is coaxially and fixedly connected to the rotating shaft, the
turbine is meshed with the threaded block, the fixing block is fixedly connected to the
turbine and rotationally connected to the
workbench, the wheel is fixedly connected to the fixing block through a pin shaft, and the rotating shaft penetrates through the workbench, the knob is coaxially and fixedly connected to the end, located outside the workbench, of the rotating shaft. The device has the advantages that the device can be quickly recycled through the straight rod, the connecting rod and the supporting rod, the space needed for storage is greatly reduced, meanwhile, the device can be automatically stretched and contracted through the
air pump, and the efficiency is improved.