In order to achieve the integrated function of absorption/transmission/reflection of airborne antenna covers, a multifunctional metasurface based on graphene and Positive Intrinsic- Negative(PIN) diode is presented, which bears the function of wideband absorption/refection/ transmission. When the PIN diode operates in forward biased condition, the transmittance of the metasurface is close to 0, and the reflection can be adjusted by changing the Fermi energy of graphene. When the Fermi level of graphene is 0.3 eV, the absorption of the metasurface is more than 90% from 1.55 GHz to 5.51 GHz, and the reflection coefficient is 45% at this band with the graphene energy level of 0eV. On the contrary, with the PIN diode acting in reverse biased condition, a transmission peak appears at 4.76 GHz with the transmission coefficients of 61% and 71% respectively when the Fermi level of graphene is 0.3 eV and 0 eV. Due to its advantages of having a simple structure, wideband absorption, and switchable refection/transmission, the proposed metasurface shows the potential in the fields of stealth of communication equipment and radar.