An insect trapper with safety protection device comprises a trapper body and a collecting box removably installed in the lower end of trapper body A fan is located in the trapper body. A safety protection device is located between said trapper body and collecting box. The safety protection device has a switch module for controlling automatic startup or automatic stop of fan. When the collecting box is detached from the lower end of trapper body, the switch module is turned off, and the fan stops running to prevent the fan from injuring hand, the use is safe and reliable, and free of locating protecting net in the lower end of trapper body and the protecting net void size, so that the big insects, e.g. moths, can pass through, big and small insects can be trapped simultaneously.
