Corrosive liquid filling machine

The utility model provides a corrosive liquid filling machine. The filling machine comprises a liquid supply pipe, a fixed machine frame, a liftable machine frame, a lifting mechanism and a filling head, the liquid supply pipe, the lifting mechanism and the filling head are fixed to the liftable machine frame through connecting pieces, and the filling machine further comprises a residual liquid collecting mechanism which comprises a residual liquid collecting tank and a residual liquid collecting tank driving mechanism. After the filling is finished, the filling head is opened; under the driving of the lifter, the lifting rod ascends upwards; when the filling head rises to the highest point; the proximity switch is triggered, air inlet valves of the first air cylinder and the second air cylinder are opened through the circuit control unit, air cylinder rods of the first air cylinder and the second air cylinder extend out at the same time and are pushed out of the residual liquid collecting tank in the directi