Piston cylinder and engineering machinery

The utility model discloses a piston cylinder which comprises a cylinder barrel, a piston, a piston rod, a guide sleeve and a cushion collar, wherein the piston is arranged inside the cylinder barrel and connected with one end of the piston rod, the guide sleeve is arranged at one end of the cylinder barrel, and the other end of the piston rod penetrates the guide sleeve and stretches out from the cylinder barrel. An oil port is formed on the guide sleeve, an annular channel is formed between the guide sleeve and the piston rod, and the oil port is communicated with a cavity with a rod of the piston cylinder through the annular channel. The cushion collar is sleeved on the piston rod and located on a step face between the piston and the piston rod, the outer diameter of the cushion collar is matched with the inner diameter of the guide sleeve, clearance is formed between the cushion collar and the piston rod, wherein at least one first tank is arranged on the step face, wherein one first tank extends along th