The utility model provides an insect collecting device. The device comprises a collection tube, a storage bottle, an air suction tube and a suction ball, a three-way pipe is arranged between the air suction pipe and the suction ball; the three-way pipe comprises a first port, a second port and a third port; the first port is connected with an air suction pipe through an air suction valve; whereinthe first port is connected with the suction ball, the second port is connected with the exhaust valve, the third port is connected with the suction ball, the air suction valve and the exhaust valve are one-way valves, the suction ball, the three-way pipe, the air suction valve, the air suction pipe, the storage bottle and the collection pipe are sequentially connected to form a through air suction channel, and the suction ball, the three-way pipe and the exhaust valve are sequentially connected to form a through exhaust channel. The insect collector is convenient and sanitary to use, strong in selectivity, high in collection efficiency, simple in structure, capable of keeping insect vitality and high in sample quality.