The utility model relates to a data acquisition device, in particular to a safety and protective date acquisition unit, which is applied to acquisition and transmission of environment data and safety protective data of function space (distribution network switch station) indoor with smaller area. The data acquisition unit is structurally characterized by comprising a CPU, a switching value acquisition interface, an analog quantity acquisition interface, a relay component, and a communication module, wherein the switching value acquisition interface and the analog quantity acquisition interface are connected with the input interface of the CPU, the relay component and the communication module are connected with the output interface of the CPU, and the CPU is a system single chip of integrated mixed signal. The date acquisition unit has the advantages of integrating the acquisition of the switching value and the analog quantity, and the alarm output and remote communication of the relay component, being clear and simple in wiring, and convenient for installation and maintenance, being capable of reducing complicated modules and wiring, simplifying maintenance, and satisfying needs and collecting safety data and requirements of environment parameter (temperature and humidity analog quantity).