The invention discloses an ecological remediation device for a water environment. The device comprises a ship body, a supporting frame, an isolating box and a control keyboard, wherein the supportingframe is arranged on the top surface of the ship body; a feeding bucket is arranged on the supporting frame; a material conveying pipe is arranged on the bottom surface of the feeding bucket; a discharging pipe is arranged on the bottom surface of the material conveying pipe; a solenoid valve is arranged on the discharging pipe; the isolation box is arranged beside the supporting frame; an end cover is arranged on the top surface of the isolation box; a handle is arranged on the end cover; a heat dissipating window is arranged on the side surface of the isolation box. The device has the beneficial effects that the ship body structure is adopted and is driven to freely move in the water environment through a prime mover, and meanwhile, the water quality information and the ion concentrationinformation of the water environment can be obtained in real time through a water quality sensor and an ion sensor; and moreover, a plurality of material storing bins are used for feeding different materials into the water environment to remediate the water environment; different water environments can be remediated; and the device can be widely popularized and utilized.