The utility model belongs to the technical field of colliery mechanical equipment and specifically relates to monomer post safety scale. This scale includes benchmark pole, bracing piece, left sighting rod, right sighting rod, the bracing piece is fixed to be set up at benchmark pole middle part, it is left sighting rod in bracing piece one side to set up with the parallel interval 200mm of benchmark pole and fixed, right side sighting rod is fixed to be set up at the bracing piece opposite side, just with the parallel interval 700mm of benchmark pole. The utility model has the advantages of simple structure and reasonable design, convenient to use, practicality are strong, measure inconvenient, unsafe drawback when effectively having overcome the bright post of use steel tape measuring, and this scale lightly, carry has easily effectively shortened the time of measuring the bright column dimension of monomer post moreover, has improved work efficiency.