Based on electric dipole resonance, a polarization-insensitive broadband metamaterial absorber in W-band is designed. The broadband metamaterial with highly symmetric structure, is composed of the periodic arrays of copper with different sizes. Absorption performance of metamaterial in W band is simulated by Finite Difference Time Domain(FDTD) method, and the physical mechanism of resonance absorption is discussed through electric field and charge distribution. The metamaterial is implemented by Printed Circuit Board(PCB), and the experimental results of absorption are compared with simulation. Experimental results show that the average absorption rate of the metamaterial in W band reaches 84.7%, which is close to the simulation results.