Three-roller continuous rolling mill capable of changing rollers in double lateral directions

The invention relates to a double-lateral roller changing three-roller continuous rolling mill which comprises a rolling mill transmission device, a rolling mill housing and a servo screw-down cylinder, and the rolling mill transmission device is arranged in an inverted Y shape; a first lateral roll changing structure and a second lateral roll changing structure are arranged on the two sides of the rolling mill housing correspondingly, the first lateral roll changing structure can push and pull the roll racks in the odd number positions to transversely move along the rolling mill housing, and the second lateral roll changing structure can push and pull the roll racks in the even number positions to transversely move along the rolling mill housing. The first lateral roll changing structure and the second lateral roll changing structure can drive the roll rack to move in the axial direction of the rolling mill housing correspondingly. The servo screw-down cylinder, the first lateral roll changing structure and