The invention discloses a multifunctional pest trap. The multifunctional pest trap comprises a rain cover, wherein connecting rods are connected with the bottom of the rain cover and connected with apest sticking plate, a container is arranged in a gap formed by the inner sides of the bottoms of the connecting rods, the outer side of the container is movably connected to the inner sides of the bottoms of the connecting rods, and an inverted net box cover is clamped at the top of the inner side of the container. The invention further discloses a method for controlling pear psylla by the multifunctional pest trap. A lure source substance for luring winter pear psylla is added to the container or the solid box cover. On one hand, the problems that an existing trap has a single function and cannot control production of female descendants are solved, and on the other hand, the problem of greater adverse impact on the environment and other microorganisms in a current pear psylla control process is solved; multiple pests are controlled simultaneously in the pest control process, and pest control target and efficiency of the trap are improved. The multifunctional pest trap is used for performing control in the dormant period of pear trees, and safe and harmless control for the pear psylla can be realized.