The invention provides a service traffic simulation method and device and a service traffic simulator. The scheme comprises the following steps: selecting at least one traffic packet needing to be sent as a target traffic packet; obtaining at least one physical network port to be subjected to packet sending; based on the obtained user instruction, obtaining the packet sending duration, the packet sending rate, the client starting IP address, the client ending IP address, the server starting IP address and the server ending IP address of the target traffic packet; and sending the target traffic packet based on the physical network port, the packet sending duration, the packet sending rate, the client starting IP address, the client ending IP address, the server starting IP address and the server ending IP address. In the scheme, after the target traffic packet is determined, the target traffic packet is bound to the physical network port for packet sending, the packet sending rule is acquired, and the packet is sent to the test object based on the packet sending rule, so that packet sending operation can be performed by adopting a plurality of physical network ports at the same time, and simultaneous execution of multiple tasks is realized.