A folding chair device of the present invention includes a seat support assembly, a backrest assembly, a leg rest assembly, a backrest driving device, a connecting rod assembly and a leg rest driving device. A bottom of the backrest assembly is pivotally connected with the seat support assembly, the backrest driving device is pivotally connected with the backrest assembly; the leg rest assembly is pivotally connected with the seat support assembly, the leg rest driving device is mounted on the seat support assembly, and the connecting rod assembly is connected with a driving end of the leg rest driving device and pivotally connected with the leg rest assembly. The inclination angle of multiple assemblies of the device can be adjusted, and the device has a simple structure and low production cost, which is suitable for popularization in industry and daily life.