Hydraulic tappet of engine

The invention relates to a hydraulic tappet of an engine. The hydraulic tappet comprises a tappet body (1), hydraulic tappet bodies (2), a roller (3), a roller pin (4) and a roller bearing (5); the two hydraulic tappet bodies (2) are arranged at an opening part at the upper end of the tappet body (1); and the roller (3) is arranged at the lower end of the tappet body (1) and is connected with the roller pin (4) in a matched manner through the roller bearing (5). The hydraulic tappet of the engine has the advantages that a valve clearance can be compensated automatically, so that the procedure of checking and adjusting the valve lash during the use process of the engine can be canceled; knocking of a valve and a rock arm during working can be eliminated, so that the noise intensity of the whole machine can be lowered; and the hydraulic tappet adopts a structure with a single tappet and double push rods, so that the number of parts of an air distribution mechanism and the cylinder distance of the engine can be