Multistage sand jet perforation and fracture combined operation method adopting coiled tubing and bottom packer

The invention relates to a multistage sand jet perforation and fracture combined operation method adopting coiled tubing and a bottom packer. The method comprises the following steps: 1, coiled tubing wellhead equipment is assembled; 2, a positioner, the packer and a sand jet perforator are connected with the tail end of the coiled tubing sequentially; 3, the coiled tubing is descended into a well; a to-be-fractured horizon is determined, the packer is set, and sealing is examined; 4, after the sealing is examined to be qualified, a pump is started to pump a perforation fluid into the coiled tubing, and the step 4 is executed again if a formation is not perforated until a casing is perforated; 6, the coiled tubing is lifted up and the packer is unset after annulus sand fracture construction, operation is performed from the step 3 when perforation and fracture of next horizon are required, otherwise, the coiled tubing is lifted to a wellhead, and the operation is ended. The method has the advantages of short operation period, flexible and careful stratification, reliable packing and clean shaft after construction and can realize multilayer test and production.