The invention discloses a portable telecommand and telemetering checking device and system for an intelligent substation and mainly aims at rapidly and conveniently finishing comprehensive and meticulous test of telecommand and telemetering information of a monitoring and moving system. The main technical scheme is as follows: the portable telecommand and telemetering checking device comprises a shell, wherein the shell is internally provided with the following modules: a human-computer interaction module, a data processing module, optical digital coding modules and optical digital signal interfaces, wherein the human-computer interaction module is used for realizing human-computer interaction, telecommand and telemetering check point table file input, check result output and power management functions; the data processing module is used for realizing the calculation and setting of telecommand and telemetering quantities, the control of a check process and the marking of a check result according to a human-computer interaction instruction sent by the human-computer interaction module; the optical digital coding modules are used for sending telecommand and telemetering application data in the data processing module to the corresponding optical digital signal interfaces after coding and assembling the telecommand and telemetering application data into pockets according to corresponding message formats; the optical digital signal interfaces are used for sending SV sampling value messages and/or GOOSE messages to a process layer measurement and control or protection and measurement integrated device.