rapidly opening and closing large umbrella, comprising a umbrella bar, an upper umbrella shell (3),a lower shell (4),a long skeleton (5) and a short skeleton (6),wherein the long umbrella skeleton is pivoted with the upper umbrella shell, wherein one end of the short umbrella skeleton is pivoted with the lower umbrella shell, and another end of the short umbrella skeleton is pivoted with the upper part of the long umbrella skeleton to form an umbrella skeleton, characterized in that, that the shield rod has an outer tube (2) and an inner tube (1), wherein the upper shield shell is fixed to the upper part of the inner tube and the lower shield shell is detachably arranged on the outer tube, wherein the upper shield shell and lower shield shell are connected by the inner tube and the outer tube,with a manual crankcase (7) and a gearbox suitable for the crankcase in the outer tube, with a synchronous band (17) in the inner tube, moving and positioning the inner tube in relation to the outer tube by the interaction of the synchronous band with the gearbox at the rotation of the handcrank (72).
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