Microinjection device

The invention discloses a microinjection device which comprises a shell and a liquid suction push rod penetrating through the shell, one end of the liquid suction push rod is located outside the shell, the other end of the liquid suction push rod is provided with a clamping piece used for fixing an injection needle, a liquid suction assembly is further arranged in the shell and comprises a first gear driving the liquid suction push rod, and a second gear driving the liquid suction push rod is further arranged in the shell. The first gear is further connected with an adjusting part located outside the shell, a first rack is arranged on a rod body of the liquid suction push rod, the first rack is connected with the first gear through a first auxiliary tooth meshed with the first rack, the adjusting part is a zero adjusting gear, the zero adjusting gear is connected with the first gear through a connecting rod, and the zero adjusting part is connected with the first gear through a second auxiliary tooth meshed w