The invention discloses a method and a device for acquiring data and a method and a device for monitoring business service quality. The method for acquiring data comprises the following steps: acquiring QoS network device information of business needing business monitoring and business information of the business; then identifying the parameter name of the business requiring business data according to acquired network device information and business information; finally, acquiring business data corresponding to the parameter name of determined business. Wit the technical proposal of the invention, accuracy of monitoring the business QoS is improved.