The invention discloses a remote automatic checking device for the coal quantity of a coal yard, which belongs to the technical field of thermal power plant coal quantity management, and comprises a scanning device, an electric rotating mechanism, an integral control system, a communication system and remote automatic checking software. The scanning device is a three-dimensional laser scanner and is fixedly mounted above a coal yard through the electric rotating mechanism; the scanning device and the electric rotating mechanism are both electrically connected with the integral control system, and the integral control system executes commands of the remote automatic checking software. A digital model of a coal yard material pile is established in combination with special technologies such as bulk material measurement, space positioning, zoning calculation and regional checking, the establishment of the material pile digital model provides latest material yard working condition information for an unmanned material piling and taking operation system module, and a bucket wheel machine is guided to complete rapid, stable and accurate material piling and taking operation. The problems that manual checking precision is low, single checking time is long, cost is high, and the coal quantity of a coal yard cannot be checked at any time are solved.