An electronic device, comprising a waterproof case (11, 12) and a flow guide assembly (17, 18), an electronic module (13, 15) and a cover, in which: the waterproof case (11, 12) comprises a closed space formed by a case top plate, a case bottom plate and a case side plate connected between the case top plate and the case bottom plate, and the flow guide assembly (17, 18), the electronic module (13, 15) and the cover are provided in the closed space; the cover comprises a cover top plate and a cover side plate, and the cover top plate and the cover side plate, together with the case bottom plate and the case side plate, form an accommodation space for accommodating the flow guide assembly (17, 18) and the electronic module (13, 15); and the cover is formed with a first vent hole and a second vent hole, and the flow guide assembly (17, 18) is configured to guide air such that same enters the accommodation space from the first vent hole, flows through the electronic module (13, 15), and is discharged from the second vent hole, wherein the flow guide assembly (17, 18) comprises a fan and an airflow guide plate, in which: the airflow guide plate is provided on the cover top plate of the cover and extends from the cover top plate of the cover toward the case bottom plate, thereby dividing the fan into a first sub-cavity and a second sub-cavity in communication with each other, the first sub-cavity being in communication with the first vent hole, and the second sub-cavity being in communication with the second vent hole; the fan is provided to guide the air such that same enters the first sub-cavity from the first vent hole, enters the second sub-cavity under the guidance of the airflow guide plate, and is discharged from the second vent hole, the first electronic module (13, 15) is provided in at least one of the first sub-cavity and the second sub-cavity, the fan is a cross-flow fan, wherein the waterproof case (11, 12) is closed and waterproof when the electronic device is inactive while when the electronic device needs to work, the waterproof case (11, 12) has to be opened. the waterproof case (11, 12) comprises a closed space formed by a case top plate, a case bottom plate and a case side plate connected between the case top plate and the case bottom plate, and the flow guide assembly (17, 18), the electronic module (13, 15) and the cover are provided in the closed space; the cover comprises a cover top plate and a cover side plate, and the cover top plate and the cover side plate, together with the case bottom plate and the case side plate, form an accommodation space for accommodating the flow guide assembly (17, 18) and the electronic module (13, 15); and the cover is formed with a first vent hole and a second vent hole, and the flow guide assembly (17, 18) is configured to guide air such that same enters the accommodation space from the first vent hole, flows through the electronic module (13, 15), and is discharged from the second vent hole, wherein the flow guide assembly (17, 18) comprises a fan and an airflow guide plate, in which: the airflow guide plate is provided on the cover top plate of the cover and extends from the cover top plate of the cover toward the case bottom plate, thereby dividing the fan into a first sub-cavity and a second sub-cavity in communication with each other, the first sub-cavity being in communication with the first vent hole, and the second sub-cavity being in communication with the second vent hole; the fan is provided to guide the air such that same enters the first sub-cavity from the first vent hole, enters the second sub-cavity under the guidance of the airflow guide plate, and is discharged from the second vent hole, the first electronic module (13, 15) is provided in at least one of the first sub-cavity and the second sub-cavity, the fan is a cross-flow fan, wherein the waterproof case (11, 12) is closed and waterproof when the electronic device is inactive while when the electronic device needs to work, the waterproof case (11, 12) has to be opened. the airflow guide plate is provided on the cover top plate of the cover and extends from the cover top plate of the cover toward the case bottom plate, thereby dividing the fan into a first sub-cavity and a second sub-cavity in communication with each other, the first sub-cavity being in communication with the first vent hole, and the second sub-cavity being in communication with the second vent hole; the fan is provided to guide the air such that same enters the first sub-cavity from the first vent hole, enters the second sub-cavity under the guidance of the airflow guide plate, and is discharged from the second vent hole, the first electronic module (13, 15) is provided in at least one of the first sub-cavity and the second sub-cavity, the fan is a cross-flow fan, wherein the waterproof case (11, 12) is closed and waterproof when the electronic device is inactive while when the electronic device needs to work, the waterproof case (11, 12) has to be opened.