PURPOSE: To prepare reinforced hose having a uniform spiral structure by a method wherein an outer and an inner spinners are inserted between an intermediate die and an inner tube die and inner and outer bobbin carriers are arranged so that they can rotate respectively in a body.

CONSTITUTION: Inner bobbin carriers 22 and outer carriers 23 are arranged in a spiral device 21 so that they can rotate respectively in a body, reinfoced yarns F1, F2 guided out from each bobbin fixed to these bobbin carriers 22, 23 are guided by each yarn hole G, G of an inner spinner 25 and an outer spinner 26 guided out on the inner tube A through a clearance between the inner tube die 2 and the intermediate die 12. In this method the reinforced hose having a reinforcing layer of uniform spiral structure can be prepared.