Balance type multi-stage regulating valve

The invention relates to a regulating valve, in particular to a balance type multi-stage regulating valve. The balance type multi-stage regulating valve comprises a valve body, a bonnet, a medium inflow passage, a medium outflow passage, a connecting passage, a valve rod, a spool and a driving part for driving the valve rod, wherein the medium inflow passage, the medium outflow passage, the connecting passage, the valve rod, the spool and the driving part are arranged on the valve body, the spool is a columnar body, and is evenly provided with a plurality of circular grooves and plugging bodies, the circular grooves are arranged along the circumference of the spool, and the plugging bodies are arranged between the circular grooves; an input passage and an output passage via which the connecting passage is communicated with the medium outflow passage are arranged on one side in the connecting passage, which is communicated with the medium outflow passage, a plurality of passages are arranged between the input