The invention discloses an insect trapping and killing device for forestry. The device comprises a trapping cylinder, a trapping platform, N pairs of fifth openings, N baffles, N pairs of stopping blocks and a trapping lamp; the trapping cylinder comprises a first shell, N first openings are formed in the peripheral surface of the lower portion of the first shell, and a driving shaft is arranged at the circle center of the top surface of the first shell; the trapping platform is arranged on the inner bottom surface of the first shell, a hemispherical insect repelling groove and a hemisphericalbait storage groove are concentrically clamped into the top surface of the trapping platform, and the insect repelling groove can rotate; the fifth openings are formed in the two sides of the first openings of the bottom surface of the first shell respectively; the N baffles are arranged in the first shell in the mode that when the baffles rotate to certain positions along with the driving shaft,the N baffles can correspondingly close the N first openings one to one; each pair of stopping blocks is correspondingly arranged at the two sides of the corresponding baffle one to one and fixedly connected with the baffle, and each pair of stopping blocks is arranged in the mode that when the corresponding baffle is located at the initial position and closes the corresponding first opening, anypair of stopping blocks can correspondingly close the fifth openings one to one. The insect trapping and killing device for forestry has the advantages that the structure is simple and the insect trapping and killing effect is good.