The invention discloses a high-speed high-accuracy recorder and a designing method thereof. The high-speed high-accuracy recorder comprises a signal conditioning module, four analogue-to-digital converter (ADC) modules, four first in first out (FIFO) modules, two synchronous dynamic random access memory (SDRAM) modules, a client-server architecture control module, a synchronous coherent clock module, a high-accuracy reference voltage source module and the like, wherein the client-server architecture control module consists of an advanced RISC machine (ARM) unit and a field programmable gate array (FPGA) unit; and the synchronous coherent clock module takes a clock chip as a core. The recorder finishes the operations of 'time-interleaved' sampling, encapsulation, caching, transmission, decapsulation combination, correction, storage, uploading and the like concurrently under the control of a concurrent time sequence logic, corrects sampling data based on an inter-ADC channel mismatchingautomatic-correction polynomial to reduce gain mismatching and offset/zero mismatching among ADC channels, reduces time mismatching among the ADC channels by using a synchronous coherent clock and a serpentine curve wire-length fine-adjustment technology, and solves the problems of associated global errors produced by data loss in the high-speed 'time-interleaved' sampling by using a high-order matching technology in which the encapsulation is performed by additional timestamp sequence numbers.