An RISC-V-based 3D interconnected multi-core processor architecture and a working method thereof. The RISC-V-based 3D interconnected multi-core processor architecture includes a main control layer, a micro core array layer and an accelerator layer, wherein the main control layer includes a plurality of main cores which are RISC-V instruction set CPU cores, the micro core array layer includes a plurality of micro unit groups including a micro core, a data storage unit, an instruction storage unit and a linking controller, wherein the micro core is an RISC-V instruction set CPU core that executes partial functions of the main core; the accelerator layer is configured to optimize a running speed of space utilization for accelerators meeting specific requirements, wherein some main cores in the main control layer perform data interaction with the accelerator layer, the other main cores interact with the micro core array layer.