The invention relates to low-voltage-cable alternating-current voltage-withstanding equipment comprising an operating box and an oil-immersed transformer. The oil-immersed transformer consists of an iron core, a primary winding, and a secondary winding, wherein the windings are arranged outside the iron core. A ratio of transformation of the primary winding to the secondary winding is 3000/200. According to the invention, the provided equipment has the low transformation ratio; and the testing voltage is easy to control. The equipment is suitable for various low-voltage-cable alternating-current voltage-withstanding tests; the instrument is light; and testing wire can be replaced conveniently. A problem that the output voltage can not be controlled can be solved completely.