A miniature fluid control device, comprising: a piezoelectric actuator comprising: a suspension plate, wherein the suspension plate is permitted or configured to undergo a curvy vibration from a middle portion to a periphery portion; an outer frame arranged around the suspension plate; at least one bracket connected between the suspension plate and the outer frame for elastically supporting the suspension plate; and a piezoelectric ceramic plate, wherein the piezoelectric ceramic plate is a square structure, a length of the piezoelectric ceramic plate is not larger than a length of the suspension plate, and the piezoelectric ceramic plate is attached on a first surface of the suspension plate, wherein when a voltage is applied to the piezoelectric ceramic plate, the suspension plate is driven to undergo the curvy vibration; and a housing comprising: a gas collecting plate, wherein the gas collecting plate is a frame body with a sidewall, and one surface of the gas collecting plate is concaved to define a gas-collecting chamber, wherein the piezoelectric actuator is accommodated within the gas-collecting chamber; and a base sealing a bottom of the piezoelectric actuator, and having a central aperture corresponding to the middle portion of the suspension plate; wherein the gas collecting plate comprises a plurality of perforations (163, 164) passing therethrough, wherein when the voltage is applied to the piezoelectric actuator, the suspension plate is permitted to undergo the curvy vibration, the fluid is transferred from the central aperture of the base to the gas-collecting chamber, and exited from the perforations (163, 164); characterized in that the suspension plate is a square structure, wherein the length of the suspension plate is in a range between 7.5mm and 12mm. a piezoelectric actuator comprising: a suspension plate, wherein the suspension plate is permitted or configured to undergo a curvy vibration from a middle portion to a periphery portion; an outer frame arranged around the suspension plate; at least one bracket connected between the suspension plate and the outer frame for elastically supporting the suspension plate; and a piezoelectric ceramic plate, wherein the piezoelectric ceramic plate is a square structure, a length of the piezoelectric ceramic plate is not larger than a length of the suspension plate, and the piezoelectric ceramic plate is attached on a first surface of the suspension plate, wherein when a voltage is applied to the piezoelectric ceramic plate, the suspension plate is driven to undergo the curvy vibration; and a suspension plate, wherein the suspension plate is permitted or configured to undergo a curvy vibration from a middle portion to a periphery portion; an outer frame arranged around the suspension plate; at least one bracket connected between the suspension plate and the outer frame for elastically supporting the suspension plate; and a piezoelectric ceramic plate, wherein the piezoelectric ceramic plate is a square structure, a length of the piezoelectric ceramic plate is not larger than a length of the suspension plate, and the piezoelectric ceramic plate is attached on a first surface of the suspension plate, wherein when a voltage is applied to the piezoelectric ceramic plate, the suspension plate is driven to undergo the curvy vibration; and a housing comprising: a gas collecting plate, wherein the gas collecting plate is a frame body with a sidewall, and one surface of the gas collecting plate is concaved to define a gas-collecting chamber, wherein the piezoelectric actuator is accommodated within the gas-collecting chamber; and a base sealing a bottom of the piezoelectric actuator, and having a central aperture corresponding to the middle portion of the suspension plate; wherein the gas collecting plate comprises a plurality of perforations (163, 164) passing therethrough, wherein when the voltage is applied to the piezoelectric actuator, the suspension plate is permitted to undergo the curvy vibration, the fluid is transferred from the central aperture of the base to the gas-collecting chamber, and exited from the perforations (163, 164); characterized in that the suspension plate is a square structure, wherein the length of the suspension plate is in a range between 7.5mm and 12mm. a gas collecting plate, wherein the gas collecting plate is a frame body with a sidewall, and one surface of the gas collecting plate is concaved to define a gas-collecting chamber, wherein the piezoelectric actuator is accommodated within the gas-collecting chamber; and a base sealing a bottom of the piezoelectric actuator, and having a central aperture corresponding to the middle portion of the suspension plate; wherein the gas collecting plate comprises a plurality of perforations (163, 164) passing therethrough, wherein when the voltage is applied to the piezoelectric actuator, the suspension plate is permitted to undergo the curvy vibration, the fluid is transferred from the central aperture of the base to the gas-collecting chamber, and exited from the perforations (163, 164); characterized in that the suspension plate is a square structure, wherein the length of the suspension plate is in a range between 7.5mm and 12mm.