The invention discloses a micro-scale MEMS energy dredging device applied to fuze and a preparation method thereof. In the invention, a pair of discharge polar plates is arranged, at a distance of 1-8microns, on an insulating substrate, and is encapsulated in an encapsulation shell; a fluid medium of air is arranged on the pair of discharge polar plates; the pair of discharge polar plates is connected in parallel at the two ends of initiating explosive device; when the initiating explosive device is in a normal state, the pair of discharge polar plates is not conducted, and the two ends of the initiating explosive device are open-circuit; when an interfering high-pulse electrostatic voltage exists on the initiating explosive device, the fluid medium of air is broken through, then the pairof discharge polar plates is conducted, the initiating explosive device is open-circuit, and the interfering high-pulse electrostatic voltage is dredged onto a MEMS energy dredging device, thereby guaranteeing safety of the initiating explosive device; the micro-scale MEMS energy dredging device disclosed by the invention has the advantages of small volume, low power consumption and low cost; andin the invention, the size effect of the device is broken, and structural breakdown can be realized with relatively low energy input (also may causing false triggering of the protected device), so asto realize dredging of electrostatic energy.