After the operation of China's high-speed railway, the geometric shape of the ballastless track structure on some lines has change to different degrees due to the long-term dynamic load of trains and the complex service environment, resulting in poor smoothness of the lines and seriously affecting the safe operation of trains. To solve this problem, by analyzing the existing restoration technologies and the functions of rope saw cutting equipment, and combining the characteristics of "restricted space" and "skylight point" short-time operation in the high-speed railway maintenance, the functional requirements of rope saw cutting equipment for the geometric shape restoration of ballastless track structures were proposed. A new multi-functional rope saw cutting equipment that could achieve lightweight modularity, autonomous movement, non-segmented horizontal cutting and bi-directional conversion cutting was developed and successfully applied in engineering practice. The results showed that the maximum static stress and displacement of the new rope saw cutting equipment were 94.5 MPa and 2.1 mm, both less than the allowable values (235 MPa and 4 mm). The first five natural frequencies of the equipment were significantly different from the standard vibration frequency of the main motion motor at 25 Hz, indicating that it had good static and dynamic characteristics. The comprehensive construction efficiency of the new rope saw cutting equipment was approximately twice that of the existing equipment, and its cutting accuracy and operational stability met the design requirements. The designed rope saw cutting equipment provides a convenient and efficient cutting tool for the ballastless track structure disintegration of high-speed railways in operation, which is of great significance for quickly restoring the alignment of high-speed railway and ensuring the normal and safe operation of trains.