The utility model relates to a direction changing device under water for a drawn net capstan machine, which belongs to the fishing machinery of aquatic products and is mainly composed of steering wheels and a fixing bracket. The utility model is characterized in that the fixing bracket is composed of a fixed axle provided with an upper steering wheel and arranged at the front end of the machine frame of the capstan machine horizontally, a chassis provided with a lower steering wheel, a supporting bar and two positioning inserted rods. Both sides of the fixed axle positioned on the upper steering wheel are respectively provided with two cross axle rod sleeves. The upper ends of the two supporting bars are sheathed in the upright rod sleeves of the two cross axle rod sleeves in the middle of the fixed axle, and the lower ends are fixed on the chassis. The two positioning inserted rods are respectively sheathed in the upright rod sleeves of the cross axle rod sleeves of both ends of the fixed axle and pass through the positioning jacks on the chassis. The utility model has the advantages of simple structure, convenient use and high reliability.