The utility model discloses a steep cotton height detection tool, include: supporting seat, setting are in measurement board on the supporting seat, lead electrical pillar, power and pilot lamp, wherein, measure the top of board and set up height and the cotton recess that standard height is the same of the volume of awaiting measuring bubble, it sets up to lead electrical pillar in the measurement board and top flushes with the surface of recess, leading electrical pillar and being provided with the multiunit, just every group leads the conducting rod that electrical pillar all includes two mutual insulation, and one of them conducting rod is connected to the negative pole of power, and the another one conducting rod passes through the pilot lamp is connected to the positive pole of power. Adopt the utility model discloses a during steep cotton height detection tool, only need to steep during the cotton places the recess, if the bubble cotton is highly up to standard, the pilot lamp that then corresponds with it lights, otherwise does not then work, and the height detection mode is simple, operation and the production efficiency height of being convenient for.