The utility model discloses a CRTSIII pattern plat type ballastless track self-compacting concrete filling tool. The CRTSIII pattern plat type ballastless track self-compacting concrete filling tool comprises a self-compacting concrete hopper machine frame and a self-compacting concrete hopper detachably arranged on the self-compacting concrete hopper machine frame, wherein the self-compacting concrete hopper comprises a hopper body used for storing self-compacting concrete and a supporting frame used for supporting the hopper body and correspondingly connected with the self-compacting concrete hopper machine frame, a valve assembly controlling discharging of the hopper body is arranged at a discharging end of the lower portion of the hopper body, the self-compacting concrete hopper machine frame comprises a primary frame and a buffer discharging hopper arranged on the primary frame, and the buffer discharging hopper is correspondingly arranged under the hopper body. The CRTSIII pattern plat type ballastless track self-compacting concrete filling tool is mainly used for filling CRTSIII pattern plat type ballastless track self-compacting concrete, and fills the self-compacting concrete conveniently and rapidly through the matching between the self-compacting concrete hopper machine frame and the self-compacting concrete hopper and the control over the valve assembly in the use process.