A solar insect killer and catcher includes a casing, a solar plate, a power supply, a control switch, a timer, a circuit board and a plurality of light-emitting elements to emit the lights having various wavelengths. If a user intends to kill or catch the insects, he/she can prepare a water-collecting basin or dig a water-collecting pit outdoors. When the casing emits the lights having various wavelengths according to the preset timings, many kinds of insects can be attracted by the lights and then fly into the water-collecting basin or water-collecting pit. As a result, the insects cannot escape from the water collecting basin or water collecting pit and be captured therein.
