Quick-switching-off and regulating valve

The invention discloses a quick-switching-off and regulating valve, and belongs to the technical field of steam valves. A valve base of the quick-switching-off and regulating valve is provided with a steam inlet, a first steam introducing port, a second steam introducing port and a steam discharge cavity which sequentially communicate with one another; a quick-switching-off valve is arranged at the first steam introducing port in a switch-on and switch-off mode, the two ends of a quick-switching-off valve element are connected with the quick-switching-off valve and a piston arranged in an oil cylinder respectively, and the oil cylinder is installed on the side wall of the valve base; the steam discharge cavity is shaped like a cylinder, an adjusting valve sleeve is coaxially and fixedly installed in the steam discharge cavity, one end of the adjusting valve sleeve communicates with the second steam introducing port, and the other end of the adjusting valve sleeve is closed; two opposite steam discharge ports