The invention relates to a concrete floor trowelling device. The device comprises a trowelling machine body, wherein a connecting rod is fixedly connected to the trowelling machine body, a handle is fixedly connected to one end of the connecting rod, a mounting block is fixedly connected to the outer wall of a protection frame of the trowelling machine body, a mounting hole is formed in the uppersurface of the mounting block, a mounting rod is slidably connected into the mounting hole, a universal wheel is fixedly connected to the lower end of the mounting rod, a locking mechanism used for enabling an operator to conveniently position the mounting rod in the mounting hole is arranged on the mounting block, and a driving mechanism used for driving the mounting rod to slide in the mountinghole is arranged among the handle, the mounting block and the mounting rod. According to the device, the mounting block is fixedly connected to the outer wall of the protection frame of the trowellingmachine body, the mounting rod is slidably connected into the mounting hole, the mounting rod is driven by the driving mechanism to slide in the mounting hole, the trowelling machine body is supported by the universal wheel, the mounting rod is locked to the inner wall of the mounting hole through the locking mechanism, and the trowelling machine body is supported, so that the operator can carrythe trowelling machine body conveniently.