The invention relates to a device for breeding trichogramma on a large scale in a factory-like manner, in particular to a trichogramma breeding device, which comprises a box body, wherein the box body consists of a box body I and a box body II; the box body I and the box body II are eudipleural; the end parts of the box body I and the box body II are connected with each other in a communicated manner through a connecting piece; an open door I and the box body I are made from transparent materials; the open door I is connected with the box body I; an open door II and the box body II are made from non-transparent materials; the open door II is connected with the box body II; the non-connected end of the box body I is provided with a light source; the light source is connected with a switch; the switch is placed at the exterior of a side surface; the inner side wall of the box body I is provided with multiple groups of parallel and symmetrical clamping pieces from top to bottom; all groups of the clamping pieces of the box body I and the box body II are all movably connected with insertion plates. The invention provides the trichogramma breeding device, by designing two areas of a breeding area and a trichogramma area, the two areas are connected with each other in the communicated manner; a parasitic breeding function and a trichogramma alternation function are completed respectively; the large-scale continuous production can be realized; the operation is simple; the production efficiency is high.