PROBLEM TO BE SOLVED: To provide a yarn splicing device that has a yarn clamping and cutting device supported so as to always speedily and suitably match a length of a yarn end part provided for a splicing process without any problem.SOLUTION: A yarn splicing device 10 as the yarn splicing device for a textile machine which manufactures a cheese winding package includes adjustment driving devices 18, 19 for a lower yarn clamping and cutting device 23A and an upper yarn clamping and cutting device 23B, and the yarn clamping and cutting devices 23A, 23B are respectively supported on a splicing prismatic body 32 movably between an outside limit position 35 and an inside limit position 36, the interval (a) between both the yarn clamping and cutting devices 23A, 23B is adjustable and the interval (a) is between one interval aand another interval a.