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This invention discloses a hydraulic thruster propulsion position monitoring mechanism, thruster, and method, which solves the problem in the prior art that displacement sensors cannot accurately locate the assembly position, and has the beneficial effect of improving product consistency. The specific solution is as follows: A hydraulic thruster propulsion position monitoring mechanism includes a transmission component installed radially on the assembly. One end of the transmission component extends into the axial process hole of the assembly. One end of the transmission component at the axial process hole contacts a guide component. An elastic component is provided at the other end of the transmission component. The end of the elastic component away from the transmission component is limited. The transmission component is connected to a position feedback column, which is installed at the axial opening of the assembly. When the assembly shaft moves relative to the assembly, it contacts the guide component, thereby driving the position feedback column to move radially.