The invention belongs to the technical field of transmissions, and particularly relates to a two-speed centrifugal block fixture block transmission. The transmission comprises a mounting plate, a drumwheel, an input shaft, a Z-shaped ring, and an output shaft; when the input shaft rotates, a driving plate rotates to drive arc-shaped strips to rotate, when the arc-shaped strips rotate at a small speed, centrifugal blocks are less affected by centrifugal force, the arc-shaped strips can drive a fixed shaft disc to rotate, and a third fixed shaft, a second one-way ring, a second sun wheel, and second planet wheels drive an annular gear to rotate; the annular gear drives the output shaft to rotate; when the arc-shaped strips move at a high speed, during the movement of a first centrifugal block, when the first centrifugal block contacts with the drum wheel, the first centrifugal block can rub against the drum wheel, the arc-shaped strips drive the drum wheel to rotate through the frictionof the first centrifugal block and the drum wheel, and a Z-shaped wheel rotates to drive the annular gear to rotate through a first one-way ring, a first sun wheel, and first planet wheels; the annular gear drives the output shaft to rotate; and the beneficial effect of two-speed drive is achieved by using a simple structure.