The invention provides a method for determining pressure of surrounding rock of a shallow-buried neighborhood tunnel in a composite stratum. The method comprises steps as follows: step 1, acquiring division information of a tunnel rock-soil body, physical and mechanics parameters of the rock-soil body and design information of a tunnel structure; step 2, determining the position of fracture surfaces of rock-soil bodies of two tunnels and a surrounding rock breakage mode; step 3, determining calculation parameters according to the breakage mode; step 4, determining tunnel arch distributed loadaccording to the breakage mode; step 5, determining the horizontal pressure of the tunnel according to the breakage mode. Breakage of the surrounding rock of the neighborhood tunnel in the composite stratum comprises two sliding breakage modes, namely, a breakage mode A and a breakage mode B; with the consideration of the influence of the excavation sequence of the composite stratum and the tunnelon the surrounding rock, the method for determining vertical arch pressure and lateral horizontal pressure of the shallow-buried neighborhood tunnel under the condition of the composite stratum is provided, and the method is simple and high in applicability.