Disclosed is a portable handheld beetle catching observer, comprising two rotation rods (1), wherein the two rotation rods (1) are rotatably connected to each other; one end of each of the two rotation rods (1) is fixedly connected to a convex lens (2) and a hemispherical cover (3), respectively, and the other end of each of the two rotation rods (1) is fixedly connected to an installation bump (5); an installation groove (15) is provided in the installation bump (5), and a rotation shaft (9) is rotatably connected to a side wall of the installation groove (15); and a connection rod (7) is fixedly connected to the rotation shaft (9), and a rotation cavity is further provided in the installation bump (5). The two connection rods (7) are gripped to drive the two rotation rods (1) to rotate, such that the convex lens (2) covers the hemispherical cover (3) to trap a beetle in the hemispherical cover (3), thereby preventing a hand from being scratched and bitten due to direct contact with the beetle; and then the beetle can be carefully observed through the convex lens (2), and at the same time the thickness and the length of the caught beetle can also be approximately estimated through a scale (4) and a spiral line on an outer side of the hemispherical cover (3).L'invention concerne un dispositif permettant de capturer et d'observer un coléoptère, comprenant deux tiges de rotation (1), les deux tiges de rotation (1) étant reliées de manière rotative l'une à l'autre ; une extrémité de chacune des deux tiges de rotation (1) est reliée à demeure à une lentille convexe (2) et à un couvercle hémisphérique (3), respectivement, et l'autre extrémité de chacune des deux tiges de rotation (1) est reliée à demeure à une bosse d'installation (5) ; une rainure d'installation (15) est disposée dans la bosse d'installation (5), et un arbre de rotation (9) est relié de façon rotative à une paroi latérale de la rainure d'installation (15) ; et une tige de liaison (7) est reliée à demeur