Rectangular pipe jacking large-angle obliquely crossing in-tunnel construction method

The invention provides a rectangular pipe jacking large-angle obliquely crossing in-tunnel construction method, which comprises the following steps that: a pipe jacking machine performs inclined tunneling to a position in front of a work well; the work well is fully filled with backfilling soil; the pipe jacking machine is slantwise pushed into the work well and forms a jacking-in section; the backfilling soil in the work well is dug away until the jacking-in section is completely exposed; the jacking-in section is dismounted and is hung out from the work well; a breast board is complementally welded in a jacking-in section cutting position on the pipe jacking machine; the steps after the operation of pushing the pipe jacking machine into the work well are repeated until a case of the pipe jacking machine completely enters the work well; and a rest part of the case of the pipe jacking machine is connected with the work well for completing the passage breakthrough. The method provided by the invention solves the problem of pipe jacking large-angle obliquely crossing in-tunnel construction, and successfully realizes the passage breakthrough.