The invention relates to the technical field of pipe fitting splicing, and discloses a pipe fitting splicing device and method. The device comprises a first support, a second support, a first slidingplate, a second sliding plate, at least one third sliding plate, a rotation device, a first bracket, at least one second bracket and an alignment device. The alignment device comprises a first alignment device body and a second alignment device body. The first alignment device body is provided with an infrared transmitting device. The second alignment device body is provided with an infrared receiving device. Each of the first alignment device body and the second alignment device body comprises a cross-shaped rod and four sleeves which sleeve the outer side of the cross-shaped rod, wherein thefour sleeves can slide and be positioned along the cross-shaped rod, and the outer end of each of the four sleeves is in screw joint with a suction cup head. The rotation device, the first bracket, the second bracket, the infrared transmitting device and the infrared receiving device are electrically connected with a pipe fitting splicing control device. According to the pipe fitting splicing device and method, the pipe fitting butt joint precision is improved, and time and labor are saved in the splicing process.