A miniature fluid control device for a miniature pneumatic device, comprising: a gas inlet plate comprising at least one inlet, at least one convergence channel and a central cavity, wherein a convergence chamber is defined by the central cavity, wherein after a gas is introduced into the at least one convergence channel through the at least one inlet, the gas is guided by the at least one convergence channel and converged to the convergence chamber; a resonance plate having a central aperture corresponding to the convergence chamber of the gas inlet plate; and a piezoelectric actuator comprising: a suspension plate, wherein a length of the suspension plate is in a range between 4mm and 8mm, a width of the suspension plate is in a range between 4mm and 8mm, and a thickness of the suspension plate is in a range between 0.1mm and 0.4mm; an outer frame, wherein the suspension plate and the outer frame are connected with each other through at least one bracket; and a piezoelectric ceramic plate, attached on a first surface of the suspension plate, wherein a length of the piezoelectric ceramic plate is not larger than a length of the suspension plate, the length of the piezoelectric ceramic plate is in a range between 4mm and 8mm, a width of the piezoelectric ceramic plate is in a range between 4mm and 8mm, a thickness of the piezoelectric ceramic plate is in a range between 0.05mm and 0.3mm, and a length/width ratio of the piezoelectric ceramic plate is in a range between 0.5 and 2; wherein the gas inlet plate, the resonance plate and the piezoelectric actuator are stacked on each other sequentially, and a gap is formed between the resonance plate and the piezoelectric actuator to define a first chamber, wherein when the piezoelectric actuator is driven and after the gas is fed into the miniature fluid control device through the at least one inlet of the gas inlet plate, the gas is sequentially converged to the central cavity through the at least one convergence channel, transferred through the central aperture of the resonance plate, introduced into the first chamber, transferred downwardly through a vacant space between the at least one bracket of the piezoelectric actuator, and exited from the miniature fluid control device. a gas inlet plate comprising at least one inlet, at least one convergence channel and a central cavity, wherein a convergence chamber is defined by the central cavity, wherein after a gas is introduced into the at least one convergence channel through the at least one inlet, the gas is guided by the at least one convergence channel and converged to the convergence chamber; a resonance plate having a central aperture corresponding to the convergence chamber of the gas inlet plate; and a piezoelectric actuator comprising: a suspension plate, wherein a length of the suspension plate is in a range between 4mm and 8mm, a width of the suspension plate is in a range between 4mm and 8mm, and a thickness of the suspension plate is in a range between 0.1mm and 0.4mm; an outer frame, wherein the suspension plate and the outer frame are connected with each other through at least one bracket; and a piezoelectric ceramic plate, attached on a first surface of the suspension plate, wherein a length of the piezoelectric ceramic plate is not larger than a length of the suspension plate, the length of the piezoelectric ceramic plate is in a range between 4mm and 8mm, a width of the piezoelectric ceramic plate is in a range between 4mm and 8mm, a thickness of the piezoelectric ceramic plate is in a range between 0.05mm and 0.3mm, and a length/width ratio of the piezoelectric ceramic plate is in a range between 0.5 and 2; a suspension plate, wherein a length of the suspension plate is in a range between 4mm and 8mm, a width of the suspension plate is in a range between 4mm and 8mm, and a thickness of the suspension plate is in a range between 0.1mm and 0.4mm; an outer frame, wherein the suspension plate and the outer frame are connected with each other through at least one bracket; and a piezoelectric ceramic plate, attached on a first surface of the suspension plate, wherein a length of the piezoelectric ceramic plate is not larger than a length of the suspension plate, the length of the piezoelectric ceramic plate is in a range between 4mm and 8mm, a width of the piezoelectric ceramic plate is in a range between 4mm and 8mm, a thickness of the piezoelectric ceramic plate is in a range between 0.05mm and 0.3mm, and a length/width ratio of the piezoelectric ceramic plate is in a range between 0.5 and 2; wherein the gas inlet plate, the resonance plate and the piezoelectric actuator are stacked on each other sequentially, and a gap is formed between the resonance plate and the piezoelectric actuator to define a first chamber, wherein when the piezoelectric actuator is driven and after the gas is fed into the miniature fluid control device through the at least one inlet of the gas inlet plate, the gas is sequentially converged to the central cavity through the at least one convergence channel, transferred through the central aperture of the resonance plate, introduced into the first chamber, transferred downwardly through a vacant space between the at least one bracket of the piezoelectric actuator, and exited from the miniature fluid control device.