The present invention discloses a liquid lens capable of realizing electronic control focusing. The liquid lens comprises: a first lens fixing ring (01), a second fixing ring (02), a first lens window(03), a piezoelectric ceramic tube (04), a straight-line guiding rail (05), a piezoelectric actuator (06), a pushing pressing piece (07), an actuating cavity (08), a liquid cavity (09), a second lenswindow (10), a lens external interface (11), a vision sensor (12), a lens shell (13), a sealed lens (14), a first sealing ring (15), a second sealing ring (16), a driving foot B (17), a piezoelectricceramic stack B (18), a actuator B shell (19), a actuator C shell (20), a piezoelectric ceramic stack C (21), a driving foot C (22), a actuator A shell (23), a piezoelectric ceramic stack A (24) anda driving foot A (25). According to the liquid lens, by applying a sinusoidal alternating current voltage signal on an internal electrode and an external electrode of the piezoelectric ceramic tube (04), a radial ultrasound field is generated in the piezoelectric ceramic tube (04), so that the internal liquid refractive index is changed, and thus focal length of the liquid lens is changed. By controlling the piezoelectric actuator (06), the liquid height in the liquid cavity (09) is changed, and thus the imaging size of objects is changed. The liquid lens capable of realizing the electronic control focusing has the advantages of convenient and simple manufacture, wide application range and strong practicability.