In order to obtain accurate external heat fluxes of space camera with attitude change that works in the medium and high earth orbit, a method to calculate its external heat fluxes was proposed. Taking a geostationary space camera as an example, the relative position among the satellite, the sun and the earth was confirmed firstly. And then the camera′s attitude was calculated according to its sun imaging mission. Finally, the instantaneous external heat fluxes on space camera were calculated based on its environmental mapping planes after changing attitude and the radiation view factors given by direct integration method. The result shows that under the same orbit condition, the total external heat fluxes of space camera with attitude change decreases dramatically by 372.5 W/m2 and 771.5 W/m2, in March equinox and December solstice respectively. The external heat fluxes on the +X direction plane where optical entrance is located increases by 2 times, and the external heat fluxes on this plane fluctuates wildly from 0 W/m2 to 1 378 W/m2. What′s more, these computational results provide a good guidance for camera′s thermal design, and this method can as well be applied to calculate the external heat fluxes of spacecraft with multi-dimensional attitude change.