The　development　of　optical　systems　is　moving　toward　multifunctionality　and　miniaturization.　Conventional　beam　splitters,　constructed　with　prisms　or　flat　glass　plates,　are　bulky　and　limit　optical　system　design.　Metasurfaces　are　artificial　planar　optical　elements　whose　flatness　and　compactness　facilitate　optoelectronic　integration　with　semiconductor　devices,　resulting　in　the　development　of　miniaturized　and　multifunctional　optoelectronic　devices.　Here,　multifunctional　beam　splitters　are　proposed　that　monolithically　integrate　metasurfaces　with　a　standard　vertical　cavity　surface-emitting　lasers　(VCSELs).　By　engineering　the　phase　profile,　the　device　can　achieve　various　beam-splitting　functions,　including　a　polarization-insensitive　high-efficiency　power　splitter,　a　multi-channel　power　splitter,　and　a　polarization　power　splitter.　Experimental　results　show　that　the　measured　splitting　ratios　(SRs)　of　the　polarization-insensitive　power　splitters　are　as　follows:　0th　to　-1st　order　ranges　from　0.92　to　70,　and　-1st　to　-2nd　order　ranges　from　0.01　to　80.　The　multi-channel　power　splitter　exhibits　SR　of　6.6:4:3:1　for　the　-1st　and　+1st　orders　in　the　x　and　y　directions.　The　polarization　power　splitters　enable　tunable　SRs　for　+/-　1　orders,　ranging　from　0.06　to　1.1.　This　on-chip　integration　of　power　beam　splitter　is　believed　has　promising　potential　to　drive　the　development　of　new　compact　optical　systems　and　advance　integrated　photonic　applications.