The invention discloses an open type micro channel plate assembly used for space environment. All components are split into single bodies, thereby facilitating processing; then micro channel plates can be accommodated and clamped through design of a frame with seam allowances, so that assembling is convenient and stability of a product can be guaranteed; polyimide frames are adopted to clamp the micro channel plates and electrodes; polyimide has the characteristics of strong insulativity, high mechanical strength, good processing manufacturability, low air escape rate and the like, is suitable for working requirements of the micro channel plate assembly, and is also suitable for application to space environment; and a conductive foil is added between the micro channel plates, the conductive foil can form an appropriate gap between the micro channel plates, electrons can move freely in the gap, the probability of incidence to the second micro channel plate is increased, and a gain of the micro channel plate assembly is improved. A traditional micro channel plate assembly does not use the conductive foil.