Novel waterproof junction box with high sealing performance

The utility model belongs to the field of electric control accessories, and particularly relates to a novel waterproof junction box with high sealing performance, an upper box assembly comprises an upper box cover and two upper wire inlet thread half pipes which are formed by reversely extending along the axial direction of the upper box cover; the lower box assembly comprises a lower box cover, two lower wire inlet thread half pipes formed by reversely extending along the axial direction of the lower box cover, and a wire loosening assembly and an alarm assembly which are arranged in the lower box cover; the upper box cover and the lower box cover are connected through a sealing fixing assembly, the upper wire inlet thread half pipe and the lower wire inlet thread half pipe are in butt joint to form a threaded pipe, a sealing ring is assembled on the inner side of the threaded pipe in an interference mode, and a wire sealing assembly is assembled on the outer side of the threaded pipe in a threaded mode. Acc