The invention discloses a foaming agent injection skid-mounted device. The foaming agent injection skid-mounted device comprises an agent tank system, an injection system and a feed pump, and the injection system and the feed pump are both connected with the agent tank system. The agent tank system comprises an agent tank and a heating system connected to the agent tank. The agent tank, the heating system, the injection system and the feed pump are all arranged on a base to form a skid-mounted design. The agent tank, the heating system, the injection system and the feed pump are all arranged inside a carriage body in a covered mode. The bottom of the carriage body is fixedly connected with the base. The carriage body is provided with a door and a window. According to the foaming agent injection skid-mounted device, linkage prolife control over a steam flooding block is achieved, and the development effect of heavy oil steam flooding is improved. The whole foaming agent injection skid-mounted device has the characteristics that the device is convenient to transport, internal facilities are compact, and daily operation is convenient.