The recent experimental data of anomalous magnetic moments strongly indicate the existence of new physics beyond the standard model. An energetic $mu^+$ beam is a potential option to the expected neutrino factories, the future muon colliders and the $mu$SR(the spin rotation, resonance and relaxation) technology. It is proposed a prompt acceleration scheme of the $mu^+$ beam in a donut wakefield driven by a shaped Laguerre-Gaussian (LG) laser pulse. The forward part of the donut wakefield can accelerate and also focus positive particle beams effectively. The LG laser is shaped by a near-critical-density plasma. The shaped LG laser has the shorter rise time and can enlarge the acceleration field. The acceleration field driven by a shaped LG laser pulse is six times higher than that driven by a normal LG laser pulse. The simulation results show that the $ mu^+$ bunch can be accelerated from $200mathrm{MeV}$ to 2GeV and the transversal size of the $mu^+$ bunch is also focused from initial $omega_0=5mu m$ to $omega=1mu m$ within several picoseconds.
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