Balance-emission bipropellant propulsion device and control method

The invention discloses a balance-emission bipropellant propulsion device and a control method, and relates to the technical field of optical earth observing satellites. The balance-emission bipropellant propulsion device comprises a first storage box, a second storage box, a first self-locking valve, a second self-locking valve, a third self-locking valve, a fourth self-locking valve and a gas circuit self-locking valve; the lower end of the gas circuit self-locking valve is communicated with the vertical top end of an inverted T-shaped pipe; the two horizontal ends of the T-shaped pipe are communicated with the first self-locking valve and the third self-locking valve respectively; the first self-locking valve is communicated with the top end of the first storage box through a pipe; thethird self-locking valve is communicated with the top end of the second storage box through a pipe; the bottom end of the first storage box is communicated with the second self-locking valve through apipe; the bottom end of t