The invention discloses an LED illuminator and a solar LED disinsection lamp, the main body of the illuminator is an arc-shaped support that is symmetrical with respect to a central axis, a plurality of semiconductor wafers are adhered onto a convex face of the support and are distributed evenly on a circumference to be interconnected in series or in parallel; the support is disposed at a centrallocation of a hollow glass bulb that is connected with a lamp cap, the axle center of the lamp cap is opposite to the axle center of the support, the lamp cap seals the glass bulb, the support is connected with the lamp cap via the positive and negative electrode posts of the semiconductor wafers that are led out via the support. The illuminator can form a horizontal circular optical radiation field that illuminates uniformly in 360 degrees, thus the optical radiation is evener and the disinsection effect is better, and the radiation performance remains unvarying upon long-term usage and the service life is prolonged.