The invention relates to an analog positioning device for adjusting a blowing nozzle of a steel plate. The device comprises a laser device, a laser device holder, an externally-installed fixing protection sleeve, a guide pin and a positioning block, wherein an inner cylindrical hole is formed in one side of the laser device holder, the laser device is installed in the inner cylindrical hole, the guide pin which is in integral structure with the laser device holder is arranged on the other side of the laser device holder, a triangular positioning block is arranged outside the guide pin, and theexternally-installed fixing protection sleeve is arranged outside the laser device holder; and the analog positioning device is installed at the front end of the blowing nozzle of the steel plate, the guide pin is inserted into an inner hole of the nozzle for positioning treatment, a nozzle head is sleeved with the externally-installed fixing protection sleeve, the triangular positioning block isinstalled in a spraying groove of the nozzle, and the nozzle is adjusted according to the field condition. According to the positioning device and the positioning method, the nozzle installation position and angle is accurately positioned, so that the analog positioning treatment and the quick adjustment can be realized without a working medium.