The invention provides a collar ironing machine, and belongs to the technical field of clothing manufacturing equipment. The machine solves the technical problem that the existing collar ironing efficiency is low. The collar ironing machine includes a machine frame, an inclined operation table is arranged on the machine frame, a clamp plate which can move along the inclined surface of the operation table is arranged on the operation table, a jacking mold plate is fixedly arranged on the clamp plate and has a sharp corner facing the upper side of the operation table, the portion, located on theupper side of the operation table, of the machine frame is provided with a lower ironing plate and an upper ironing plate, the upper ironing plate can move up and down and is arranged above the lowerironing plate in parallel, the jacking mold plate can stretch between the upper ironing plate and the lower ironing plate, and a drive part which can drive the upper ironing plate to ascend and descend is arranged on the machine frame. According to the collar ironing machine, the temperatures of the upper ironing plate and the lower ironing plate can be set according to the need, the ironing timecan be preset according to materials of cloth, the whole ironing process is rapid, efficient, accurate and reliable, and the quality and efficiency of collar ironing can be effectively improved.