Frequency converter having dustproof and waterproof functions

The utility model discloses a frequency converter having dustproof and waterproof functions. The frequency converter comprises a casing, wherein the casing is connected with a square tube type skirtboard below a bottom board, the skirtboard is internally provided with an upper baffle board, a lower baffle board, and upper choke boards and lower choke boards which are arranged in a staggered mode, and an annular dedusting filtering net. According to the frequency converter having the dustproof and waterproof functions, the upper choke boards and the lower choke boards are arranged in the staggered mode in the square tube type skirtboard at the lower portion of the frequency converter casing, so an air flow is enabled to form U-shaped tortuous flow among the upper choke boards and the lower choke boards, moisture contained in the air flow can be intercepted by the choke boards when the choke boards contact with the air flow, moisture separation is realized, and moisture is prevented from entering the frequency converter casing to damage components, moreover, the annular dedusting filtering net is arranged in the inner-most-layer choke board to prevent dusts from entering the frequency converter casing to damage the components; the frequency converter itself has the dustproof and waterproof functions, so the fault rate of the frequency converter is low, and service life is long.