A direct-drive electric outboard engine, comprising an external rotor mechanism, a stator mechanism, a first end cap (102, 300), a second end cap (103, 400), a first fairwater (104, 800) and a second fairwater and a controller module, wherein the external rotor mechanism comprises an external rotor and an impeller; the external rotor is located outside the stator mechanism; the impeller is located outside the external rotor; the first end cap (102, 300) and the second end cap (103, 400) are respectively provided at two ends of the stator mechanism; the first fairwater (104, 800) is mounted at one end of the stator mechanism; and the second fairwater is mounted at the other end of the stator mechanism, wherein: a first seal is provided between the first end cap (102, 300) and the stator mechanism, a second seal is provided between the second end cap (103, 400) and the stator mechanism, and the first seal and the second seal are realized by means of an oil seal; and the second fairwater is provided to be movable with respect to the stator mechanism, and the second fairwater is configured to be rotatable along with the external rotor mechanism; and: a first controller mounting area is provided inside the first fairwater (104, 800), and the controller module is located in the first controller mounting area, or a second controller mounting area is provided inside the second fairwater, and the controller module is located in the second controller mounting area. wherein the external rotor mechanism comprises an external rotor and an impeller; the external rotor is located outside the stator mechanism; the impeller is located outside the external rotor; the first end cap (102, 300) and the second end cap (103, 400) are respectively provided at two ends of the stator mechanism; the first fairwater (104, 800) is mounted at one end of the stator mechanism; and the second fairwater is mounted at the other end of the stator mechanism, wherein: a first seal is provided between the first end cap (102, 300) and the stator mechanism, a second seal is provided between the second end cap (103, 400) and the stator mechanism, and the first seal and the second seal are realized by means of an oil seal; and the second fairwater is provided to be movable with respect to the stator mechanism, and the second fairwater is configured to be rotatable along with the external rotor mechanism; and: a first controller mounting area is provided inside the first fairwater (104, 800), and the controller module is located in the first controller mounting area, or a second controller mounting area is provided inside the second fairwater, and the controller module is located in the second controller mounting area. a first seal is provided between the first end cap (102, 300) and the stator mechanism, a second seal is provided between the second end cap (103, 400) and the stator mechanism, and the first seal and the second seal are realized by means of an oil seal; and the second fairwater is provided to be movable with respect to the stator mechanism, and the second fairwater is configured to be rotatable along with the external rotor mechanism; and: a first controller mounting area is provided inside the first fairwater (104, 800), and the controller module is located in the first controller mounting area, or a second controller mounting area is provided inside the second fairwater, and the controller module is located in the second controller mounting area. a first controller mounting area is provided inside the first fairwater (104, 800), and the controller module is located in the first controller mounting area, or a second controller mounting area is provided inside the second fairwater, and the controller module is located in the second controller mounting area.