Concrete polishing machine for building

The utility model discloses a building concrete polishing machine which comprises a rack body and a polishing mechanism used for polishing concrete, a pushing guide rod and a guide rod which penetratethrough the rack body are arranged on the upper end face of a mounting plate, and a manual adjusting mechanism capable of adjusting the height of the polishing mechanism is arranged on the upper portion of the rack body. The manual adjusting mechanism comprises a pressing rod and a limiting non-return assembly, one end of the pressing rod is hinged to the upper end face of the rack body, the lower side wall of the pressing rod is connected to the upper end face of the rack body through a reset spring, a guide rail is arranged on the wall of the pressing rod, a sliding seat sliding on the guide rail is installed on the guide rail, and the top end of the pushing guide rod is hinged to the sliding seat. The limiting non-return assembly is arranged at the end, close to the holding pressing rod, of the pressing rod an