Animal training device disclosed. The animal training device for being worn on an animal being trained and for training by use of stimulus includes a device body, being worn on a neck of the animal being trained by a fastener, wherein the device body comprises a plurality of module bases in which a plurality of unit modules are respectively disposed, a body base having a plurality of compartments in which the plurality of unit modules are respectively disposed and at least one module connecting portion connecting two compartment, a plurality of module covers being respectively disposed on the plurality of module bases to form a space, PCB portion, being disposed in the space, and a contact terminal, being disposed on a part of the plurality of module covers.