The present invention relates to a method and device for transmitting and receiving data in a wireless communication system. According to the present invention, provided is a method comprising a step of receiving, from a network node, a request message requesting an E-UTRAN radio access bearer (E-RAB) configuration for data transmission and reception of a mission critical service (MCS), wherein the request message includes indication information for permitting transmission and reception of the data in at least one first measurement gap, when data of the MCS is generated in the at least one first measurement gap, transmitting, to the terminal, at least one of measurement gap information related to the at least one first measurement gap in which the indication information or the data is transmitted, and transmitting, to the terminal, the data in the at least one measurement gap.