A beam jet propeller is provided, especially a beam jet propeller which increases the friction force of the fluid by spiral or linear diversion protrusions or diversion grooves on the inner wall of a tube, such that original loose fluid can be twisted together into a beam shape under pressure/rotation/extrusion and form inter-tube pressure. The beam fluid may generate a strong propelling force. Meanwhile, because less air is included in this beam fluid, the bubble friction is smaller and acoustic noise is greatly decreased. The present invention does not adopt a traditional propeller as the propelling device, therefore, the cavitation due to Bernoulli theorem is not generated, and the problem of resistance force and drag force in the fluid is also eliminated. The propelling force is thus greatly increased.