Venturi valve and vacuum power assisting device

The utility model discloses a venturi valve and a vacuum power assisting device, which relate to the technical field of automobiles, and solve the technical problem that a treading pedal easily becomes slightly hard when an automobile is braked due to the fact that the vacuum degree of the interior of the existing vacuum power assisting device is relatively low in the prior art. The venturi valve comprises an exhaust tube, a venturi tube, a connecting tube body, a vent tube, a first check valve and at least one second check valve, wherein respective air inlet ports of the first check valve and the second check valve are connected with the air outlet port of the exhaust tube, the air outlet port of the first check valve is communicated with the small-diameter port of the venturi tube, and the air outlet port of the second check valve is communicated with the small-diameter port of the venturi tube through the connecting tube. The vacuum power assisting device comprises a power source, an air filter, a power booster and the venturi valve provided by any one technical scheme of the utility model. The venturi valve is used for improving the vacuum degree of the vacuum power assisting device.