A fluid control device, comprising: a piezoelectric actuator comprising a suspension plate, an outer frame, at least one bracket and a piezoelectric element, wherein the outer frame is arranged around the suspension plate, the at least one bracket is connected between the suspension plate and the outer frame, the piezoelectric element is attached on the suspension plate, and a length of a side of the piezoelectric element is equal to or less than a length of a side of the suspension plate; a housing comprising an outlet plate and a base, wherein the outlet plate comprises a sidewall and a bottom plate, the sidewall is protruded from edges of the bottom plate, an accommodation space is defined by the sidewall and the bottom plate collaboratively, and the piezoelectric actuator is disposed within the accommodation space, wherein the base comprises an inlet plate and a resonance plate, the base covers the accommodation space of the outlet plate to seal the piezoelectric actuator, the inlet plate comprises a convergence chamber connected to outside, the resonance plate is fixed on the inlet plate, the resonance plate comprises a central aperture, and the central aperture is aligned with the convergence chamber; and a glue body arranged between the outer frame of the piezoelectric actuator and the resonance plate of the base to maintain a gap (h) formed between the piezoelectric actuator and the resonance plate of the base, characterized in that a linear expansion coefficient of the suspension plate is lower than a linear expansion coefficient of the piezoelectric element, and the linear expansion coefficient of the suspension plate is different from a linear expansion coefficient of the resonance plate, and after a heating and pressing process is performed to fix the piezoelectric actuator on the base through the glue body, the suspension plate is bent toward the piezoelectric element and the resonance plate is bent away from the suspension plate in the room temperature due to the different linear expansion coefficient of the piezoelectric element and the suspension plate, so that a deformation displacement (δ) between the suspension plate and the resonance plate is obtained. a piezoelectric actuator comprising a suspension plate, an outer frame, at least one bracket and a piezoelectric element, wherein the outer frame is arranged around the suspension plate, the at least one bracket is connected between the suspension plate and the outer frame, the piezoelectric element is attached on the suspension plate, and a length of a side of the piezoelectric element is equal to or less than a length of a side of the suspension plate; a housing comprising an outlet plate and a base, wherein the outlet plate comprises a sidewall and a bottom plate, the sidewall is protruded from edges of the bottom plate, an accommodation space is defined by the sidewall and the bottom plate collaboratively, and the piezoelectric actuator is disposed within the accommodation space, wherein the base comprises an inlet plate and a resonance plate, the base covers the accommodation space of the outlet plate to seal the piezoelectric actuator, the inlet plate comprises a convergence chamber connected to outside, the resonance plate is fixed on the inlet plate, the resonance plate comprises a central aperture, and the central aperture is aligned with the convergence chamber; and a glue body arranged between the outer frame of the piezoelectric actuator and the resonance plate of the base to maintain a gap (h) formed between the piezoelectric actuator and the resonance plate of the base, characterized in that a linear expansion coefficient of the suspension plate is lower than a linear expansion coefficient of the piezoelectric element, and the linear expansion coefficient of the suspension plate is different from a linear expansion coefficient of the resonance plate, and after a heating and pressing process is performed to fix the piezoelectric actuator on the base through the glue body, the suspension plate is bent toward the piezoelectric element and the resonance plate is bent away from the suspension plate in the room temperature due to the different linear expansion coefficient of the piezoelectric element and the suspension plate, so that a deformation displacement (δ) between the suspension plate and the resonance plate is obtained.