The invention belongs to the field of single-chip microcomputer application and provides a device for downloading programs of a single-chip microcomputer and a debugging method. The device comprises a file opening member, a file storing member, an eraser, a write-in device, a reader, a calibrator, an operation member, a stopping member, a reset member and a connection monitoring member. By means of the above members, the programs designed under the development environment of the single-chip microcomputer can perform operation such as write-in and erasion on chips, and control on operation of the single-chip microcomputer can be achieved. Therefore, the device has the advantages of being visualized and dynamic in operation, easy to operate, and suitable for being used by developers of all single-chip microcomputers.