The invention discloses a method, a system and a device for dynamic packet loss control based on scalable video coding (SVC), which are used for solving the problem of packet loss control in SVC different actual transmission processes in the prior art. The method includes that a client detects quality of played video resources and sends control instructions for controlling the quality to a server, and the server judges whether packet loss processing is performed on a data packet through the control instructions and Naltype information value of the data packet to be transmitted. Due to the fact that the client detects the quality of the played video resources to generate the control instructions for performing packet loss processing on the data packet, the server can perform real-time dynamic packet loss processing according to playing states of the client.