The invention discloses a data sampler being universally used by a voltage-type sensor and an inductively coupled plasma (ICP) sensor. A signal switching circuit is connected between the sensor and a control circuit to form a data sampler circuit; the control circuit is formed by connecting a digital signal processor (DSP) and a field programmable gate array (FPGA); the signal switching circuit comprises two relays with double-pole-double-throw switches; and the input signals in different working modes are sent to a signal conditioning and amplifying circuit by the relays under the control ofinput and output (IO) ports of the FPGA, so as to form the data sampler circuit. In the invention, the data sampler is designed by combining the FPGA and a switch technique; the function switch of the data sampler can be performed under the control of a microprocessor or a microcontroller; electrical signals output by most of sensors are sampled and effectively converted by combining the data sampler and a high-resolution AD converter, thus providing effective data sources for subsequent data analysis and processing.