Supercharger air inlet connecting pipe and engine

The invention discloses a supercharger air inlet connecting pipe and an engine, and belongs to the technical field of automobiles. The supercharger air inlet connecting pipe comprises a first passagefor air circulation and a second passage, a first inlet for air inflow and a first outlet for air outflow are formed in the first passage, the first outlet is connected with a supercharger air inlet,and the inner diameter of the first outlet is the same as that of the turbocharger air inlet; and the second passage is used for the exhaust gas circulation in a crankcase, the second passage communicates with the supercharger, the second passage and the first passage are arranged at intervals, and an inclination angle alpha is arranged between the wall surface, close to the first passage, of thesecond passage and the horizontal direction, a third passage for the circulation of cooling water in the engine is arranged on the peripheral wall of the second passage, and the third passage is usedfor the peripheral wall wall