The invention discloses an insect quantity survey method which comprises the following steps: (1) beating a branch carrying insects to ensure that the insects drop into a collecting container arranged below the branch and provided with a piece of wet paper, thereby obtaining a piece of wet paper carrying the insects; (2) placing the wet paper carrying the insects in an insect collecting bag, and sealing the insect collecting bag to obtain a collecting bag filled with the insects, wherein the insect collecting bag contains a substance capable of killing or narcotizing insects; (3) calculating the quantity of the insects in the collecting bag filled with the insects, thereby achieving insect quantity detection. Proved by tests, the insect quantity survey method is accurate and reliable in data, simple and convenient to operate, and low in production cost, and facilitates further classification, identification, number representation, and preparation of insect specimens.