The invention provides a shower nozzle positioning method and a shower nozzle positioning device. According to the method, a shower nozzle positioning device is used for recording a shower nozzle spraying direction; and on the basis of the shower nozzle spraying direction recorded by the shower nozzle positioning device, adjustment of a shower nozzle spraying position is adjusted. The shower nozzle positioning device includes a positioning plate provided with an avoidance hole corresponding to a shower nozzle; and a marking region or an annular scale is arranged at the periphery of the avoidance hole. Besides, a positioning mechanism in positioning cooperation with an end surface of a roller is also arranged.