The invention discloses a tunnel connection channel construction method based on a freezing method. The tunnel connection channel construction method comprises the steps: (S1) assembling seams betweentunnel wall segments around an opening of a to-be-excavated tunnel connection channel are welded, and the tunnel wall segments within the range of the opening of the to-be-excavated tunnel connectionchannel are dismantled; (S2) the tunnel connection channel is excavated through a full section method, after excavating, a soil body is subjected to heat preservation, and a primary support is constructed; (S3) the surface of the primary support is leveled, exposed steel bar joints are cut off or ground flush, and then a waterproof layer is constructed; and (S4) a secondary lining is constructed,and thus construction of the tunnel connection channel is completed. The construction steps are simple and easy to implement, and the tunnel connection tunnel meeting the design requirements can be obtained.