The invention discloses a low error oscilloscope improving an amplifier structure. The low error oscilloscope comprises an attenuator, a pre-amplifier, a sampler, an analog-digital converter, a memory, a sampling clock, a time-base circuit, a crystal oscillator, a central processing unit, a displayer and an antenna module; the attenuator, the pre-amplifier, the sampler, the analog-digital converter, the memory, the central processing unit and the displayer are connected in sequence; an analog-digital conversion circuit is further connected to the sampling clock, and the time-base circuit is connected to the sampling clock, the crystal oscillator and the central processing unit separately; the central processing unit is further connected to the antenna module. In the low error oscilloscope improving the amplifier structure, the central processing unit is adopted, the operational capability and processing function are strong, not only is the performance of an oscilloscope enhanced, but also multiple expandable interfaces are added, meanwhile the circuit of a sampling part is divided into multiple modules of the sampling clock, the time-base circuit, the crystal oscillator and the like, and the function is detailed, which facilitates reduction of errors of internal circuits and makes internal arrangement more user-friendly.