A control device for fluid pressure and flow direction includes a fan and a frame member. The fan has an inlet and an outlet and the frame member provides at least a first opening and a second opening at two lateral sides thereof. A middle solid part is disposed in the frame member extending to the second opening from the first opening in a way of gradual convergence. A flow passage is formed between the middle solid part and the frame member with an end thereof at the second opening side being greater than the other end at the first opening side. Therefore, the fluid is controlled to increase or decrease the pressure thereof, decrease noise and flow direction.