Insect trapper capable of automatically replenishing water

The utility model relates to an insect trapper capable of automatically replenishing water, comprising a trapping container filled with water, trapping cores, a water bottle for replenishing water into the trapping container and a support, wherein a water bottle fixing bracket and a trapping container fixing bracket are arranged on the support, the trapping container is arranged on the trapping container fixing bracket, the opening of the water bottle is downwards faced to be arranged on the water bottle fixing bracket, the opening of the water bottle extends into the water surface of the trapping container, and at least one of the trapping cores are hung on the support. The trapper is convenient to use, is low in cost, can be used for many years, and can be used for trapping a mass of injurious insects in the prevention and control of the agricultural injurious insects.