The utility model relates to a be total to bars low noise amplifier circuit based on current reuse electric capacity cross coupling, it adopts the current reuse technique mainly by two NMOS pipes, two PMOS pipes, nine electric capacity, five inductance and four resistors, under the same bias current condition, through electric capacity cross coupling altogether bars NMOS input tube to, electric capacity cross coupling altogether bars PMOS input tube to common production input mutual conductance. Do you improve input voltage under the same bias current condition output current's conversion efficiency makes low -noise amplifier's equivalence input mutual conductance increase, has improved low -noise amplifier's voltage gain. Simultaneously and since flow through two electric capacity cross coupling altogether the right electric current of bars input tube be same electric current, have very strong dependence between the produced channel current noise, low -noise amplifier's noise does not increase in proportion, therefore the noise coefficient of this structure compares traditional structure and has certain improvement.