An image surveillance device includes a casing, a heat dissipating cover, a partition, a lens module, and a light emitting module. The heat dissipating cover covers the casing and has a heat conduction sheet extending inward into the casing. The partition is disposed in the casing to divide an inner space of the casing into an upper space and a lower space. The lens module is disposed in the lower space for capturing images. The light emitting module is disposed on the heat conduction sheet and located in the upper space for emitting light out of the casing when the lens module captures the images. Heat generated by the light emitting module is conducted to the heat dissipating cover via the heat conduction sheet.