The invention provides a super-resolution direction-finding device used for rapidly and real time estimating a spatial spectrum and a direction-finding method thereof. The super-resolution direction-finding device mainly consists of a principal-subordinate DSP parallel signal processing module formed by a group of DSP, a logic control module formed by FPGA and a communication interface module, wherein, the communication interface module is used for receiving sampling data of all channels from a digital receiver and reporting calculated angles to a host computer; a principal DSP and a subordinate DSP in the parallel signal processing module are connected in a bus-sharing close coupling mode, and a data bus is utilized to transmit the middle data among DSP; a DSP bus and the logic control module are mutually connected by the data bus, an address bus and a control bus. The invention can be used for rapidly and precisely finding direction for a plurality of radiant sources and further precisely positioning the radiant sources, and also can be used for tracking and positioning moving radiant sources according to requirements, or can be arranged on a moving device to track and position the radiant sources, and simultaneously, the invention also can be used for the boat positioning, the maritime search and rescue, the radar exploration in a civil aviation airport, the direction finding of undesired signals, and the like.