The invention relates to the field of a radio frequency power device, and discloses a radio frequency SOI LDMOS device with close body contact. The device comprises bottom layer silicon, an embedding oxidation layer, top layer silicon, a P region an N region, a gate oxidation layer, a polysilicon gate layer, a gate poly-silicide layer, a gate electrode, a silicon nitride side wall, an N drift region, a drain region, a drain region silicide layer, a drain electrode, a source region, a body contact region, a body region, a source region silicide layer and a source electrode. The radio frequency LDMOS device is manufactured on an SOI substrate, and forms the close body contact which is in short circuit with the source region by utilizing a heavily doped region in the same form as the P region; the source/body, a drain/body and the gate and the electrodes are interconnected by the silicide; a plurality of gate bars are connected in parallel in the forked mode so as to improve the driving capability of the device; a method for adjustment, back-gate injection, N region injection and N drift region injection, which is compatible with the CMOS process, is designed; and a method for hiding the silicide in the N drift region, which is compatible with the CMOS process, is designed.