The invention discloses a right-angled distribution engine with a suspension piston, which comprises a cylinder (1) and a piston (2). The sidewall forming part of the cylinder (1) for suspension or quasi-suspension of the piston (2) is provided with one or a plurality of lower sidewall distribution channel(s) (5001), the sidewall of the cylinder 1 in each lower sidewall distribution channel (5001) is provided with one or a plurality of lower sidewall distribution base opening(s) (4), and a lower sidewall distribution valve (5) is arranged at each lower sidewall distribution base opening (4) and is controlled by a lower sidewall distribution valve timing control mechanism (6) to open or close the lower sidewall distribution base opening (4) according to a timing relationship. Since the valve seat opening on the side face of the cylinder is arranged above the seal section of the piston, the invention can avoid the engine oil from being scraped into the channel, thereby preventing the engine oil scraped into the channel from flowing into the combustion chamber or being directly discharged into the atmosphere, reducing the environmental pollution and prolonging the service life of the engine.