Multi-component fluid proportion controller

The invention discloses a multi-component fluid proportion controller which comprises a shell, a transmission shaft and a metering assembly. A liquid cavity is formed in the shell in a hollowed-out mode. The shells with different heights are longitudinally overlapped to form a box body, and every two adjacent shells are separated through a bearing plate. The three points O1, O2 and O3 are respectively and correspondingly provided with a transmission shaft, a plurality of shells share the transmission shafts, and the transmission shafts synchronously rotate through gears. A metering assembly is arranged in each shell to form a flow control channel, and each metering assembly comprises a leakage blocking rotor and a displacement rotor. The leakage blocking rotor is arranged on the transmission shaft corresponding to the O3. The displacement rotors are respectively arranged on the transmission shafts corresponding to the O1 and the O2. The cavity, the leakage blocking rotor and the at least one displacement roto