The invention provides an internet based workshop monitoring system and method. In the internet based workshop monitoring system, a workshop real-time monitor photographs the workshop environment; when abnormal temperature change is judged to exist in video data, a video segment with the abnormal temperature change is intercepted, is defined as a workshop doubtable video, and is sent to a mobile terminal through a communication unit; the mobile terminal is used for a worker to sieve the received workshop doubtable videos and uploads the sieved workshop doubtable videos to a server; the server generates a reminding command based on the abnormal condition in the workshop doubtable video and sending the reminding command to a workshop terminal; and the workshop terminal displays the received reminding command and gives an early warning. According to the system, the environment pictures of the workshop are photographed through in an infrared camera at night, real-time monitoring for the workshop environment is realized. When exceptions such as a fire or pilferage occur, the photographed video can be reported in time.